Showing "tooltips" for list items in RadComboBox

RELATED TO:

Article information

Article relates to

 RadControls for WinForms

Created by

 Dimitar Kapitanov

Last modified

 Sep 11, 2008

Last modified by

 Dimitar Kapitanov


HOW-TO
Show "tooltips" for list items in RadComboBox.

SOLUTION
There are two ways of doing this:

The first approach is to assign directly the text to be displayed to every ComboBoxItem. This is done through the API or through the design time. You must assign the required text to every item’s ToolTipText.





The second approach is to handle the ToolTipTextNeeded event where custom logic can be applied:

        private void TestComboBox1_Load(object sender, EventArgs e)  
        {  
            ComboPopupForm parent = this.radComboBox1.ComboBoxElement.ListBoxElement.ElementTree.Control as ComboPopupForm;  
            if (parent != null)  
            {  
                parent.ToolTipTextNeeded += new Telerik.WinControls.ToolTipTextNeededEventHandler(radComboBox1_ToolTipTextNeeded);  
            }  
        }  
 

Add an event handler to the event of the popup form to listen for the ToolTipTextNeeded event (inside of it the ListBoxElement lives so the form control is responsible for bubbling the tooltip events). This can be done inside the Load event of the form.

The task is to display tooltip only for the second item inside the combobox control and the code is:

        private void radComboBox1_ToolTipTextNeeded(object sender, Telerik.WinControls.ToolTipTextNeededEventArgs e)  
        {  
            RadComboBoxItem item = sender as RadComboBoxItem;  
            if (item != null)  
            {  
                if (this.radComboBox1.Items.IndexOf(item) == 1)   
                {  
                    e.ToolTipText = "this is the second item";   
                }  
            }  
        } 


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