vcl-170124-expressquantumtreelist-feature-center-layout-features-customization-form.md
The customization form allows end-users to change the visibility of a band or column using drag-and-drop operations. The headers of hidden bands and columns are contained in the customization form in the associated tabs. Headers in tabs are displayed in alphabetical order.
To hide a band or a column, drag its header to the customization form. While dragging, a corresponding tab (Bands or Columns) is automatically activated for the header being dragged.
The customization form can be invoked by end-users using the column header context menu.
The table below lists the main properties that relate to the customization form.
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Window Instance
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The tree list’s Customizing property.
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Visibility
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The tree list’s Customizing.Visible property. The OnCustomizationFormVisibleChanged event is fired after the form’s visibility has been changed.
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Bounds
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The tree list’s Customizing.RowCount property.
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Contents
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The tree list’s OptionsView.SimpleCustomizeBox and OptionsView.Bands properties.
The Options.Hidden property of a column or band.
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