Makes the receiver visible and brings it to the front
of the display.
@return the selected color, or null if the dialog was
cancelled, no color was selected, or an error
occurred
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
Makes the receiver visible and brings it to the front of the display.
@return the selected color, or null if the dialog was cancelled, no color was selected, or an error occurred
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul>