@Override
 public void drawScreen(int mouseX, int mouseY, float par3) {
   super.drawScreen(mouseX, mouseY, par3);
   updateScrollbar(mouseX, mouseY, par3);
 }
 @Override
 public void onGuiClosed() {
   super.onGuiClosed();
   logic.worldObj.markBlockForUpdate(logic.xCoord, logic.yCoord, logic.zCoord);
 }