Hi Shinu,
I have tried various combinations of those settings. Even with the current settings (shown below) the behavior is the same.
<telerik:RadTreeView name="tvAreas" ID="tvAreas" runat="server" BackColor="#FFFFFF"
BorderColor="#CCCCCC" CheckBoxes="True" CheckChildNodes="False" ForeColor="Black"
Height="250px" MultipleSelect="False" TriStateCheckBoxes="False" Width="200px"
DataFieldID="Area_ID" DataFieldParentID="Parent_ID" DataTextField="Area" DataValueField="Company_Area_ID"
BorderStyle="Solid" BorderWidth="1">
</telerik:RadTreeView>