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. At run-time, the user can resize the drop down filter window by clicking the left-bottom ticker. The FilterBarDropDownHeight property is changed if the user resizes the drop down filter window. Use the ShowFilter method to show programmatically the column's drop down filter window. The FilterBarPromptVisible property specifies whether the filter prompt is visible or hidden. The filter prompt feature allows you to filter the items as you type while the filter bar is visible on the bottom part of the list area. The Filter prompt feature allows at runtime filtering data on hidden columns too.

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 Tree1
    .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 Tree1
    .FilterBarDropDownHeight = 1
End With