def addListItem(self, component, title, valid=True, checked=True):
item = QListWidgetItem(title)
item.component = component
item.setFlags(item.flags() | Qt.ItemIsUserCheckable)
if valid:
pass
else:
item.setForeground(QColor('gray'))
if checked:
item.setCheckState(Qt.Checked)
else:
item.setCheckState(Qt.Unchecked)
self.components_list.addItem(item)
