Actually weird... In this page SmartGWT should be mobile oriented: "mobile adaptation is built in": https://www.smartclient.com/product/smartgwt.jsp
"... your Smart GWT application supports mobile. Device-aware components automatically switch appearance and behavior to best suit the size of the device, and to provide a better experience for touch screens. Finger taps and gestures arrive as normal mouse events, so your event handlers just work - users can even trigger context menus and hovers via touch-and-hold, and drag and drop via finger slides."
I think you need to ask SmartGWT people about this problem.