Change style via tapping Add Gradient directly should not result in Invalid style sheet

Steps:
1. Create a Qt Gui Application via wizard
2. Double click .ui file to swap to Designer
3. Drag and drop a PushButton component
4. Right click PushButton and select Change styleSheet
5. Tap 'Add Gradient' to edit style->error
6. Tap 'Add Color' to edit style->error

Expected Result:
Style sheet can be edited. 'Valid Style Sheet' displays.

Actual Result:
'Invalid Style Sheet' displays. Only can use Pull-Down Menu to select details and then edit style sheet.

Comments:
Add Resource or Add Gradient or Add Color should work as the default option, at least should not be the invalid option. E.g. : Add Resource works as default background-image, Add Gradient works as default color, Add Color works as default color.
The installed package is: qt-creator-win-opensource-2.1.81-201103160102-setup.exe.
SDKTestRound3