初学者 VC CLR界面怎么实现缩放功能？

书上说用ScaleTransform函数
我想 按button1画线 button2放大 但是 button2无反应
#pragma endregion
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
Pen^my=gcnew Pen(Color::Black);
Graphics^my1=this->CreateGraphics();
my1->DrawLine(my,0,0,100,100);

}
private: System::Void button2_Click(System::Object^ sender, System::EventArgs^ e)
{

Graphics^my=this->CreateGraphics();
my->ScaleTransform(10,10);
}

还是按照之前我说的，检查下button2的click事件有没有挂钩到button2_Click