The TargetControlID property specifies the ID of the element that should be 'tooltipified'. It can be set declaratively on the page:

CopyASPX

<telerik:RadToolTip ID="RadToolTip1" runat="server" TargetControlID="Button1" IsClientID="true">
</telerik:RadToolTip>

...and in the code-behind:

• C#
• VB.NET

CopyC#

Button button1 = new Button(); 
button1.ID = "Button1"; 
RadToolTip1.TargetControlID = button1.ID;

CopyVB.NET

Dim button1 As New Button()
button1.ID = "Button1"
RadToolTip1.TargetControlID = button1.ID

By default, RadToolTip assumes a server ID. If the ID is client-side, as in the case where an element is pure HTML and not a server control, then the IsClientID property should be set to True.

• C#
• VB.NET

CopyC#

Button button1 = new Button();
button1.ID = "Button1"; 
RadToolTip1.TargetControlID = button1.ClientID; 
RadToolTip1.IsClientID = true;

CopyVB.NET

Dim button1 As New Button()
button1.ID = "Button1"
RadToolTip1.TargetControlID = button1.ClientID
RadToolTip1.IsClientID = True