The ExG2antt ActiveX Control can group the columns into two categories: locked and unlocked. The Locked category contains all the columns that are fixed to the left area of the client area. These columns cannot be scrolled horizontally. Use the CountLockedColumns to specify the number of locked columns. The unlocked are contains the columns that can be scrolled horizontally. To change the background color of the control's locked area use BackColorLock property. Use the SelBackColor property to specify the background color for selected items. Use the CellBackColor property to assign a different background color for a specified cell. Use the ItemBackColor property to specify the item's background color. Use the BackColorAlternate property to specify the background color used to display alternate items in the control. Use the Picture property to assign a picture to the control's background. Use the BackColor property to specify the chart's background color.