Op 23-9-2010 15:46, Aaron Lewis schreef: > Hi, > Playing with qt 4.6.3 with qtcreator 1.3.1 , > > connect(ui->rangeRadio,SIGNAL(clicked(bool)), > this,SLOT(setMode( !bool ))); > > Am i making something wrong here ? got red lines below texts .. Yes, this is wrong. The !bool is invalid. Bool is not a variable, it is a type name. André