Adding a RadGrid (Or Any Control) to ComboBox at Runtime

[Andrew]

How do I go about adding a RadGrid to a RadComboBox at runtime in order to make a multi-column dropdown similar to the one sampled here:http://demos.telerik.com/ASPNET/Prometheus/Combobox/Examples/Functionality/Templates/DefaultCS.aspx (the Initiator).

I've created custom Templates before, but I'm having trouble figuring out what steps are necessary in the situation. Among other things I've tried the following:

DataTable table;

table = //Set the table via a sql query.

RadGrid grid = new RadGrid();

grid.DataSource = table;
grid.DataBind();

RadComboBoxItem item = new RadComboBoxItem();
item.Controls.Add(grid);

combo.Items.Add(item);

Thanks.

[Rosi]

Hi Andrew,

I think the code that you paste should works as expected.

You can also follow our article Adding templates at runtime

Regards,
Rosi
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Andrew]

Unfortunately it does not work. I'm am currently getting this error when I add the RadGrid to the RadComboBoxItem and bind the RadComboBox:

"Script control '' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptcontrol"

Any idea what this means?

[Rosi]

Hello Andrew,

This problem occurs if RadComboBox populates its items by using the LoadOnDemand feature.Then the items are loaded during callback. RadGrid registers its scripts in the Pre_Render event  which is not executed during callback. This causes the issue. However this cannot be overridden. I suggest you do not use LoadOnDemand in this case.

Kind regards,
Rosi
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.