Readme.md

WinForms TreeList - Display node checkboxes for a specific tree level

This example shows how to show checkboxes within nodes displayed at a specified tree level and hide/disable checkboxes for other nodes.

The CustomDrawNodeCheckBox event is handled to hide checkboxes or set them to disabled.

void treeList_CustomDrawNodeCheckBox(object sender, CustomDrawNodeCheckBoxEventArgs e) {
    bool canCheckNode = CanCheckNode(e.Node);
    if (canCheckNode)
        return;
    e.ObjectArgs.State = DevExpress.Utils.Drawing.ObjectState.Disabled;
    e.Handled = NeedHide;
}

The BeforeCheckNode event is handled to prevent users from changing the state of disabled checkboxes.

void treeList_BeforeCheckNode(object sender, CheckNodeEventArgs e) {
    e.CanCheck = CanCheckNode(e.Node);
}

Files to Review

• Form1.cs (VB: Form1.vb)

Documentation

• Node Checking - Checkboxes and Radio Buttons

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