How to prevent child nodes from being expanded if their parent node is checked

Hello,
From what I gather, you want to prevent child nodes from being expanded if their parent node is checked. Based on the How to add Checkedit in parent node for treelist in c# ? ticket, you must be using an in-place CheckEdit to check a node. In this case, I recommend that you handle the BeforeExpand event and cancel the node expansion if its parent node is checked.

C#
private string checkedColumnFieldName = "Is Checked";  
private void treeList1_BeforeExpand(object sender, DevExpress.XtraTreeList.BeforeExpandEventArgs e) {  
            TreeListNode parentNode = GetParentByLevel(e.Node, 0);  
            if (parentNode == null) {  
                return;  
            }  
            bool isChecked = (bool)parentNode.GetValue(checkedColumnFieldName);  
            e.CanExpand = !isChecked;  
}  
private TreeListNode GetParentByLevel(TreeListNode node, int level) {  
            TreeListNode parentNode = node.ParentNode;  
            while (parentNode != null) {  
                if (parentNode.Level == level) {  
                    return parentNode;  
                }  
                parentNode = parentNode.ParentNode;  
            }  
            return null;  
}  

Visual Basic 6
Private checkedColumnFieldName As String = "Is Checked"  
        Private Sub treeList1_BeforeExpand(ByVal sender As Object, ByVal e As DevExpress.XtraTreeList.BeforeExpandEventArgs) Handles treeList1.BeforeExpand  
            Dim parentNode As TreeListNode = GetParentByLevel(e.Node, 0)  
            If parentNode Is Nothing Then  
                Return  
            End If  
            Dim isChecked As Boolean = CBool(parentNode.GetValue(checkedColumnFieldName))  
            e.CanExpand = Not isChecked  
        End Sub  
        Private Function GetParentByLevel(ByVal node As TreeListNode, ByVal level As Integer) As TreeListNode  
            Dim parentNode As TreeListNode = node.ParentNode  
            Do While parentNode IsNot Nothing  
                If parentNode.Level = level Then  
                    Return parentNode  
                End If  
                parentNode = parentNode.ParentNode  
            Loop  
            Return Nothing  
        End Function  

Please note that TreeList provides a built-in functionality allowing you to show check-boxes within nodes. To enable it, set the TreeListOptionsView.ShowCheckBoxes property to true. By using this feature, the abovementioned solution will be simplified:

C#
private void treeList1_BeforeExpand(object sender, DevExpress.XtraTreeList.BeforeExpandEventArgs e) {  
            TreeListNode parentNode = GetParentByLevel(e.Node, 0);  
            if(parentNode == null)  
                return;  
            e.CanExpand = !parentNode.Checked;  
}  

C#
Private Sub treeList1_BeforeExpand(ByVal sender As Object, ByVal e As DevExpress.XtraTreeList.BeforeExpandEventArgs) Handles treeList1.BeforeExpand  
            Dim parentNode As TreeListNode = GetParentByLevel(e.Node, 0)  
            If parentNode Is Nothing Then  
                Return  
            End If  
            e.CanExpand = Not parentNode.Checked  
End Sub  
Private Function GetParentByLevel(ByVal node As TreeListNode, ByVal level As Integer) As TreeListNode  
            Dim parentNode As TreeListNode = node.ParentNode  
            Do While parentNode IsNot Nothing  
                If parentNode.Level = level Then  
                    Return parentNode  
                End If  
                parentNode = parentNode.ParentNode  
            Loop  
            Return Nothing  
End Function  

I have attached samples showing both approaches. Please check them and let me know if I can be of further help.