fix

sysgo/UI/main_screen.go

@@ -281,7 +281,6 @@ func (self *MainScreen) SwapAndShow() {
 		surface.Blit(self.HWND, self.CanvasHWND, &rect_, nil)
 	}
 
-
 	display.Flip()
 }
 
@@ -428,8 +427,7 @@ func (self *MainScreen) ShowMsg(content string, blocktime int) {
 
 	if blocktime > 0 {
 		time.BlockDelay(blocktime)
-		self.CurrentPage.Draw()
-		self.SwapAndShow()
+		self.Refresh()
 	}
 
 }