Make CPPopUpButton `selectedTag` private API to match Cocoa.
Make CPPopUpButton `selectedTag` private API to match Cocoa.

cacaodev/cappuccino,dgvivero/CappCoreData,krodelin/cappuccino,mrcarlberg/cappuccino,zittix/cappuccino,rgv151/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,primalmotion/cappuccino,kidaa/cappuccino,FrankReh/cappuccino,mrcarlberg/cappuccino,wangshijin/cappuccino,AlexanderMazaletskiy/cappuccino,rgv151/cappuccino,dgvivero/CappCoreData,tolmasky/cappuccino,kidaa/cappuccino,koamac/Cappuccino,daboe01/cappuccino,dgvivero/CappCoreData,deltaprojects/cappuccino,FrankReh/cappuccino,Dogild/cappuccino,koamac/Cappuccino,cappuccino/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,daboe01/cappuccino,Dogild/cappuccino,tolmasky/cappuccino,krodelin/cappuccino,dgvivero/CappCoreData,AlexanderMazaletskiy/cappuccino,Dogild/cappuccino,cappuccino/cappuccino,mrcarlberg/cappuccino,koamac/Cappuccino,tancred/cappuccino,FrankReh/cappuccino,cacaodev/cappuccino,wangshijin/cappuccino,enquora/cappuccino,tancred/cappuccino,daboe01/cappuccino,krodelin/cappuccino,zittix/cappuccino,tolmasky/cappuccino,mrcarlberg/cappuccino,deltaprojects/cappuccino,Rosch/cappuccino,cappuccino/cappuccino,FrankReh/cappuccino,krodelin/cappuccino,zittix/cappuccino,kidaa/cappuccino,tolmasky/cappuccino,krodelin/cappuccino,deltaprojects/cappuccino,enquora/cappuccino,cacaodev/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,AlexanderMazaletskiy/cappuccino,FrankReh/cappuccino,Dogild/cappuccino,koamac/Cappuccino,cacaodev/cappuccino,daboe01/cappuccino,rgv151/cappuccino,deltaprojects/cappuccino,kidaa/cappuccino,deltaprojects/cappuccino,enquora/cappuccino,enquora/cappuccino,enquora/cappuccino,AlexanderMazaletskiy/cappuccino,primalmotion/cappuccino,primalmotion/cappuccino,zittix/cappuccino,daboe01/cappuccino,Rosch/cappuccino,wangshijin/cappuccino,zittix/cappuccino,daboe01/cappuccino,rgv151/cappuccino,FrankReh/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,Dogild/cappuccino,deltaprojects/cappuccino,krodelin/cappuccino,tolmasky/cappuccino,cappuccino/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,krodelin/cappuccino,zittix/cappuccino,AlexanderMazaletskiy/cappuccino,tancred/cappuccino,FrankReh/cappuccino,Dogild/cappuccino,daboe01/cappuccino,primalmotion/cappuccino,FrankReh/cappuccino,enquora/cappuccino,primalmotion/cappuccino,zittix/cappuccino,tancred/cappuccino,wangshijin/cappuccino,cappuccino/cappuccino,koamac/Cappuccino,cacaodev/cappuccino,wangshijin/cappuccino,wangshijin/cappuccino,cacaodev/cappuccino,Rosch/cappuccino,Rosch/cappuccino,enquora/cappuccino,koamac/Cappuccino,tancred/cappuccino,cappuccino/cappuccino,deltaprojects/cappuccino,rgv151/cappuccino,tancred/cappuccino,cappuccino/cappuccino,kidaa/cappuccino,Dogild/cappuccino,dgvivero/CappCoreData,rgv151/cappuccino,AlexanderMazaletskiy/cappuccino,rgv151/cappuccino