IconMenuButton vs ToolStripMenuButton on click

SmartClient Version: v9.1p_2014-04-29/Pro Deployment (built 2014-04-29)

When I click on the Title of the ToolStripMenuButton, the menu opens.
When I click on the Title of the IconMenuButton, the menu does not open; I have to click on the down-arrow icon to get the menu to open.

Is there an option to specify that clicking anywhere on the IconMenuButton will open the menu to get similar behaviour to the ToolStripMenuButton?

Thanks