[INTERNAL] using Select control instead of ComboBox control
[INTERNAL] using Select control instead of ComboBox control

fixing some render/layout and usability issues

Change-Id: I4e6f13e120656ba617144af98ce94230d37c52b9

SQCLabs/openui5,cschuff/openui5,cschuff/openui5,SAP/openui5,nzamani/openui5,olirogers/openui5,nzamani/openui5,olirogers/openui5,olirogers/openui5,SQCLabs/openui5,nzamani/openui5,SAP/openui5,cschuff/openui5,SAP/openui5,SQCLabs/openui5,SAP/openui5