将用户控件加载到RadToolTip中？

Question

I'm trying to load a user control into a RadToolTip upon button click. Once I click the button, I want to load the user control and then call the control's Initialize method, passing a collection of objects I have stored in the page viewstate.

Here is the RadToolTip markup:

<telerik:RadToolTip runat="server" ID="_MyToolTip" HideEvent="ManualClose" 
    Position="Center" Width="500px" Height="400px" Animation="Fade"
    ShowEvent="OnClick" ShowDelay="0" RelativeTo="Element"
    TargetControlID="_MySelectButton" RenderInPageRoot="True" />

Here is the Click event handler for MyButton :

protected void _MySelectButton_Click(object sender, EventArgs e)
{
    Control ctrl = Page.LoadControl(@"~/UserControls/MyUserControl.ascx");

    var muc = (ctrl as MyUserControlClass);

    muc.Initialize(_MyViewStateCollection); 
}

I want it so that when _MySelectButton_Click fires, it will create a new instance of MyUserControl , and then that event will propagate up into the RadToolTip so that the tooltip appears, and then the user control within the tooltip. However, right now only the RadToolTip appears, with no user control within it.

I found this post on Telerik's site which states:

Click events are not fired for a tooltipified element

The RadToolTip registers event handlers for the client-side events and therefore they cancel the further click propagation so that the tooltip remains visible, as a postback would hide it. This means that when the ShowEvent is set to OnClick elements such as Buttons, CheckBoxes, RadioButtons, LinkButtons may not fire their server events or even their client-side behavior may change (espeacially for the RadioButton and CheckBox - they will not change their states, as the click is cancelled). To avoid this set the ShowEvent to OnFocus or to OnMouseOver, for example. The same holds true for the RadToolTipManager as well.

If the problem is that the button's Click is essentially incompatible given that the RadToolTip is preventing the click from propagating, how can I achieve the desired behavior? Bottom line, I want to be able to click a button, open a tooltip, then open my user control within that tooltip. Please help, thanks!

Answer 1

I found this post on Telerik's site where someone was having issues having two RadToolTipManager objects on the same page.

As I've been trying to add the RadToolTip to a page with an already existing RadToolTipManager , I decided to change my RadToolTip into an additional RadToolTipManager and explicitly specify the TargetControlID to reference _MySelectButton , and now the button click produces the tooltip along with the expected user control elements.

<telerik:RadToolTipManager runat="server" ID="_MyToolTipManager"
    OffsetY="-1" OffsetX="250" HideEvent="ManualClose" Width="500" Height="400"
    RelativeTo="Element" RenderInPageRoot="True"
    OnAjaxUpdate="MySelectButtonToolTipManagerAjaxUpdate"
    ShowEvent="OnClick" Animation="Slide">

    <TargetControls>
        <telerik:ToolTipTargetControl TargetControlID="_MySelectButton" />
    </TargetControls>

</telerik:RadToolTipManager>

Here is the associated handler for the RadToolTipManager 's OnAjaxUpdate event:

protected void MySelectButtonToolTipManagerAjaxUpdate(
    object sender, ToolTipUpdateEventArgs e)
{
    Control ctrl = Page.LoadControl(@"~/UserControls/MyUserControl.ascx");
    ctrl.ID = "MyUserControl";
    e.UpdatePanel.ContentTemplateContainer.Controls.Add(ctrl);           
    var li = (ctrl as MyUserControlClass);

    li.Initialize(MyViewStateCollection);
}

Problem solved!