Hello Astrata,

I’ve made a small test with WebDataTree. I tested the CheckBoxSelectionChanged event and it’s get fired every time when I check either uncheck checkbox.

The code that I’m using is :

<ig:WebDataTree ID="WebDataTree1" runat="server" Height="300px" Width="200px" 
        onselectionchanged="WebDataTree1_SelectionChanged" CheckBoxMode="BiState" 
        oncheckboxselectionchanged="WebDataTree1_CheckBoxSelectionChanged"
        AutoPostBackFlags-CheckBoxSelectionChanged="On">
            <Nodes>
                <ig:DataTreeNode Text="Root Node">
                    <Nodes>
                        <ig:DataTreeNode Text="Child Node">
                        </ig:DataTreeNode>
                        <ig:DataTreeNode Text="Child Node">
                        </ig:DataTreeNode>
                    </Nodes>
                </ig:DataTreeNode>
                <ig:DataTreeNode Text="Root Node">
                </ig:DataTreeNode>
            </Nodes>
        </ig:WebDataTree>

Server side:

protected void WebDataTree1_CheckBoxSelectionChanged(object sender, 

Infragistics.Web.UI.NavigationControls.DataTreeCheckBoxSelectionEventArgs e)

    {


    }

Can you tell me what is your version?  I made the test with 10.3 RTM

Thanks.