property Column.FilterBarDropDownWidth as Double
Specifies the width of the drop down filter window proportionally with the width of the column.

TypeDescription
Double A double expression that indicates the width of the drop down filter window proportionally with the width of the column. If the FilterBarDropDownWidth expression is negative, the absolute value indicates the width of the drop down filter window in pixels. Else, the value indicates how many times the width of the column is multiply to get the width of the drop down filter window. 
By default, the FilterBarDropDownWidth property is 1, and so, the width of the drop down filter window coincides with the width of the column. Use the Width property to specify the width of the column. Use FilterBarDropDownHeight property to specify the height of the drop down filter window. Use the FilterBarHeight property to specify the height of the control's filter bar. Use the DisplayFilterButton property to display a filter button to the column's caption. 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. Use the ShowFilter method to show programmatically the column's drop down filter window.

The following VB sample specifies that the width of the drop down filter window is double of the column's width:

With G2antt1.Columns(0)
    .FilterBarDropDownWidth = 2
End With

The following VB sample specifies that the width of the drop down filter window is 150 pixels:

With G2antt1.Columns(0)
    .FilterBarDropDownWidth = -150
End With