TreeList.ShowFilterPopupCheckedListBox Event

Fires before a pop-up filter menu is displayed. Allows you to customize the value checklist.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v21.1.dll


public event FilterPopupCheckedListBoxEventHandler ShowFilterPopupCheckedListBox

Event Data

The ShowFilterPopupCheckedListBox event's data class is DevExpress.XtraTreeList.FilterPopupCheckedListBoxEventArgs.


If the TreeListColumn.OptionsFilter.FilterPopupMode property is set to CheckedList, the pop-up filter menu contains a value checklist. You can handle the ShowFilterPopupCheckedListBox event to customize the checklist (for instance, disable or hide particular values).


The following example shows how to remove the “(Select All)” item from the Department Column’s Filter DropDown.


View Example

using System;
using System.Windows.Forms;
using DevExpress.XtraTreeList;

namespace ShowFilterPopupCheckedListBox_example
    public partial class Form1 : Form
        public Form1()

        private void Form1_Load(object sender, EventArgs e)

        private void treeList1_ShowFilterPopupCheckedListBox(object sender, FilterPopupCheckedListBoxEventArgs e)
            if (e.Column.FieldName != "Department") return;
            // disable "(Select All)" item
            e.CheckedComboBox.SelectAllItemVisible = false;
See Also