By default, the FilterBarDropDownHeight property is 0.5. It means, the height of the drop down filter window is half of the height of the control's list. Use the FilterBarDropDownHeight property to specify the height of the drop down window filter window. Use the DisplayFilterButton property to display a filter button to the column's caption. Use the FilterBarDropDownWidth property to specify the width of the drop down filter window. Use the Description property to define predefined strings in the filter bar. Use the FilterInclude property to specify whether the child items should be included to the list when the user applies the filter.

If the FilterBarDropDownHeight property is negative, the absolute value of the FilterBarDropDownHeight property indicates the height of the drop down filter window in pixels. In this case, the height of the drop down filter window is not proportionally with the height of the control's list area. For instance, the following sample specifies the height of the drop down filter window being 100 pixels:

With Gantt1
    .FilterBarDropDownHeight = -100
End With

If the FilterBarDropDownHeight property is greater than 0, it indicates the height of the drop down filter window proportionally with the height of the control's height list. For instance, the following sample specifies the height of the drop down filter window being the same with the height of the control's list area:

With Gantt1
    .FilterBarDropDownHeight = 1
End With

The drop down filter window always include an item.