Asp.net ajax combobox doesn't display correctly when inserted inside a tab control

I have a display problem when I try to use a ajax combobox inside a tab control: when my tab control loads on the page where the combobox is, everything works fine; however, if it loads on a another page, the you change to the page which contains the combobox, the right button (which opens the list of the combobox) isn't displayed at all.

Has someone bee开发者_如何学编程n through this behavior? And maybe found a solution ?

Thanks in advance !

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Use Firebug in FireFox (this tool is very good if you dont use it) and right-click the area where your drop arrow should be, then select "Inspect Element". At the bottom of your browser screen, you will see a couple windows. One window will detail teh styles being applied to the arrow area.

Look for a style that is making visibility of either a <td> or <img> to be hidden. The Ajax ComboBox control, sadly, is laid out in a table.