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我有两个表单登录和 MDI 父表单。当我登录时，它会显示 MDI Parent 表单。有 1 个按钮注销。当我按下注销然后登录表单显示和 MDI 父表单隐藏。我想要 MDI 父表单锁定后端并在前面登录表单。如何锁定 MDI 父窗体以输入或单击？