void setSelected(boolean state) {
			isSelected = state;
			titleLabel.setForeground(state ? activeForeground : inactiveForeground);
			repaint();
		}
Sets the focus state.  If in focus use color in the gradient and white lettering.
Otherwise use gray gradient and black lettering.
@param state the focus state.
Ghidra/Framework/Docking/src/main/java/docking/GenericHeader.java