By default, the FormatCell property is empty.  The format is being applied if valid ( not empty, and syntactically correct ). The expression may be a combination of variables, constants, strings, dates and operators, and value. The value operator gives the value to be formatted.  A string is delimited by ", ` or ' characters, and inside they can have the starting character preceded by \ character, ie "\"This is a quote\"". A date is delimited by # character, ie #1/31/2001 10:00# means the January 31th, 2001, 10:00 AM. The FormatColumn property applies the predefined format for all cells in the columns. The CellValue property indicates the cell's value.

The CellValue property of the cell is being shown as:

• formatted using the FormatCell property, if it is valid
• formatted using the FormatColumn property, if it is valid

For instance:

• the "currency(value)" displays the column using the current format for the currency ie, 1000 gets displayed as $1,000.00
• the "longdate(date(value))" converts the value to a date and gets the long format to display the date in the column, ie #1/1/2001# displays instead Monday, January 01, 2001
• the "'<b>' + ((0:=proper(value)) left 1) + '</b>' + (=:0 mid 2)" converts the name to proper, so the first letter is capitalized, bolds the first character, and let unchanged the rest, ie a "mihai filimon" gets displayed "Mihai Filimon".
• the "len(value) ? ((0:=dbl(value)) < 10 ? '<fgcolor=808080><font ;7>' : '<b>') + currency(=:0)" displays the cells that contains not empty daya, the value in currency format, with a different font and color for values less than 10, and bolded for those that are greater than 10, as can see in the following screen shot in the column (A+B+C):

The value keyword in the FormatColumn property indicates the value to be formatted. 

The expression supports cell's identifiers as follows:

• %0, %1, %2, ... specifies the value of the cell in the column with the index 0, 1 2, ... The CellValue property specifies the cell's value. For instance, "%0 format ``" formats the value on the cell with the index 0, using current regional setting, while "int(%1)" converts the value of the column with the index 1, to integer.
• %C0, %C1, %C2, ... specifies the caption of the cell, or the string the cell displays in the column with the index 0, 1 2, ... The CellCaption property specifies the cell's caption. The cell's value may be different than what the cell displays as a string. For instance, let's say a cell display HTML format. The %0 returns the html format including the HTML tags, while %C0 returns the cell's content as string without HTML tags. For instance, "upper(%C1)" converts the caption of the cell with the index 1, to upper case, while "%C0 left 2" returns the leftmost two characters on the cell with the index 0.
• %CD0, %CD1, %CD2, ... specifies the cell's extra data in the column with the index 0, 1 2, ... The CellData property associates any extra/user data to a cell. For instance, "%CD0 = `your user data`" specifies all cells whose CellData property is `your user data`, on the column with the index 0.
• %CS0, %CS1, %CS2, ... specifies the cell's state in the column with the index 0, 1 2, ... The CellState property specifies the cell's state, and so it indicates whether the cell is checked or un-checked. For instance, "%CS0" defines all checked items on the column with the index 0, or "not %CS1" defines all un-checked items in the column with the index 1.

The predefined operators for auto-numbering are:

• number index 'format', indicates the index of the item. The first added item has the index 0, the second added item has the index 1, and so on. The index of the item remains the same even if the order of the items is changed by sorting. For instance, 1 index '' gets the index of the item starting from 1 while 100 index '' gets the index of the item starting from 100. The number indicates the starting index, while the format is a set of characters to be used for specifying the index. If the format is missing, the index of the item is formatted as numbers. For instance: 1 index 'A-Z' gets the index as A, B, C... Z, BA, BB, ... BZ, CA, ... . The 1 index 'abc' gives the index as: a,b,c,ba,bb,bc,ca,cb,cc,.... You can use other number formatting function to format the returned value. For instance "1 index '' format '0||2|:'" gets the numbers grouped by 2 digits and separated by : character.

  In the following screen shot the FormatColumn("Col 1")  = "1 index ''"

  

  In the following screen shot the FormatColumn("Col 1")  = "1 index 'A-Z'"

  

   

• number apos 'format' indicates the absolute position of the item. The first displayed item has the absolute position 0 ( scrolling position on top  ), the next visible item is 1, and so on.  The number indicates the starting position, while the format is a set of characters to be used for specifying the position. For instance, 1 apos '' gets the absolute position of the item starting from 1, while 100 apos '' gets the position of the item starting from 100. If the format is missing, the absolute position of the item is formatted as numbers.

  In the following screen shot the FormatColumn("Col 1")  = "1 apos ''"

  

  In the following screen shot the FormatColumn("Col 1")  = "1 apos 'A-Z'"

  

• number pos 'format' indicates the relative position of the item. The relative position is the position of the visible child item in the parent children collection. The number indicates the starting position, while the format is a set of characters to be used for specifying the position. For instance, 1 pos '' gets the relative position of the item starting from 1, while 100 pos '' gets the relative position of the item starting from 100. If the format is missing, the relative position of the item is formatted as numbers. The difference between pos and opos can be seen while filtering the items in the control. For instance, if no filter is applied to the control, the pos and opos gets the same result. Instead, if the filter is applied, the opos gets the position of the item in the list of unfiltered items, while the pos gets the position of the item in the filtered list.

  In the following screen shot the FormatColumn("Col 2")  = "'<b>' + 1 pos '' + '</b> ' + value"

  

  In the following screen shot the FormatColumn("Col 2")  = "'<b>' + 1 pos 'A-Z' + '</b> ' + value"

  

• number opos 'format' indicates the relative old position of the item. The relative old position is the position of the child item in the parent children collection. The number indicates the starting position, while the format is a set of characters to be used for specifying the position.For instance, 1 pos '' gets the relative position of the item starting from 1, while 100 pos '' gets the relative position of the item starting from 100. If the format is missing, the relative position of the item is formatted as numbers. The difference between pos and opos can be seen while filtering the items in the control. For instance, if no filter is applied to the control, the pos and opos gets the same result. Instead, if the filter is applied, the opos gets the position of the item in the list of unfiltered items, while the pos gets the position of the item in the filtered list.
• number rpos 'format' indicates the relative recursive position of the item. The recursive position indicates the position of the parent items too. The relative position is the position of the visible child item in the parent children collection. The number indicates the starting position, while the format is of the following type "delimiter|format|format|...". If the format is missing, the delimiter is . character, and the positions are formatted as numbers. The format is applied consecutively to each parent item, from root to item itself.

  In the following screen shot the FormatColumn("Col 1")  = "1 rpos ''"

  

  In the following screen shot the FormatColumn("Col 1")  = "1 rpos ':|A-Z'"

  

  In the following screen shot the FormatColumn("Col 1")  = "1 rpos '.|A-Z|'"

  

  In the following screen shot the FormatColumn("Col 1")  = "1 apos ''" and FormatColumn("Col 2")  = "'<b><font Tahoma;10>' + 1 rpos '.|A-Z|' + '</font></b> ' + value"

  

• number rindex 'format', number rapos 'format' and number ropos 'format' are working similar with number rpos 'format', excepts that they gives the index, absolute position, or the old child position.

This property/method supports predefined constants and operators/functions as described here.