public static FormToolBox GetInstance()
{
//存储唯一对象的字段为空，或者窗口对象已经被释放
if (ftb == null || ftb.IsDisposed)
{
ftb = new FormToolBox();
ftb.MdiParent = FormParent.ActiveForm;
}
return(ftb);
}
private void toolBoxToolStripMenuItem_Click(object sender, EventArgs e)
{
FormToolBox.GetInstance().Show();
}
