Switch DataSources Dynamically

[JD Emmert]

I have a RadComboBox1 that I want to show nothing in until the RadComboBox2 above it has a selected value.  I do this by not setting a data source on RadComboBox1.  Once a value is selected in RadComboBox2 on the server side I am setting a new datasource and loading the RadComboBox1.  This works the first time I have selected an option in RadComboBox2 that has associated data.  When I select an item in RadComboox2 that does not have associated data, RadComboBox1 will not clear. 

I have tried the following to clear RadComboBox1:

                RadComboBox1.ClearSelection();
            RadComboBox1.Text = string.Empty;
            RadComboBox1.Items.Clear();
            RadComboBox1.DataSource = null;
            RadComboBox1.DataBind();

            while (RadComboBox1.Items.Count > 0)
            {
                RadComboBox1.Items.Remove(0);
            }

However nothing seems to allow me to remove the items from RadComboBox1.  I have tried this code on RadComboBox2 selected index changed, on RadComboBox1 items requested and elsewhere.  Any help would be appreciated.

[Simon]

Hi JD Emmert,

Calling Items.Clear() would suffice. Can you please debug and see how many Items are there after calling it? At which point during the page life cycle do you do this - Page_Load, SelectedIndexChanged, etc.?

Kind regards,
Simon
the Telerik team

[JD Emmert]

I finally discovered the problem, it was a few stupid, simple mistakes.  I didn't have the control surrounded in an ajax panel and I did not have both of the controls that update the rad drop down box listed in the rad ajax manager.  Thanks for your help though.