I have a 10 X 10 square QFrame grid. my goal is to have a button to be checked for what color you want and then mouse over the frame and click and the QFrames background changes to the color that was selected.

Qt Code: 
  1. void matrix::REDBTN()
  2. {
  3.     if (ui->REDbtn->isChecked())
  4.     {
  5.         ui->GREENbtn->setChecked(false);
  6.         ui->BLUEbtn->setChecked(false);
  7.         ui->WHITEbtn->setChecked(false);
  8.         ui->PURPLEbtn->setChecked(false);
  9.         ui->YELLOWbtn->setChecked(false);
  10.         ui->CYANbtn->setChecked(false);
  11.         if (ui->REDbtn->isChecked())
  12.         {
  13.             ui->box_0_0->mousePressEvent(setStyleSheet("background-color: rgb(255,0,0)"));
  14.         }
  15.     }
  16. }
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i get an error when using this code. what am i doing wrong?