DropDownExtender Control
The DropDownExtender control is another extender that can be used with a number of
ASP.NET controls for enhanced visual rendering of a drop-down control. Despite its
name, the DropDownExtender is not only limited to ASP.NET DropDownList controls and can,
in fact, be used with many other controls such as a TextBox control or even a Label control.
And much like the previous control, it has an additional property called
DropDownControlID, which is the ID of the control containing the actual content for Drop-
Down. Take a look at the sample that comes with the ASP.NET AJAX Control Toolkit and
focus your attention on the DropDown.aspx page as shown in Figure 7-19.
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Figure 7-19. Example of the DropDown extender control
Viewing the code reveals a few LinkButton controls as options for the drop-down:
Style="display :none; visibility: hidden;">
CssClass="ContextMenuItem" OnClick="OnSelect" />
CssClass="ContextMenuItem" OnClick="OnSelect" />
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