Windows Media Player 11 SDK BUTTONELEMENT.downToolTip
The downToolTip attribute specifies or retrieves the ToolTip text that appears when the mouse is over the BUTTONELEMENT and the BUTTONELEMENT is in the down state.
This attribute is a read/write String with a default value of "" (empty string) with a maximum length of 1024 characters.
When this attribute is set to "" (empty string), no ToolTip is displayed.
Windows Media Player version 7.0 or later.