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| I embed a form in a panel, and the embedded code is as follows: FormInput = new InputForm (this);
 FormInput.TopLevel = false;
 FormInput.Parent = this.panel2;
 FormInput.Dock = DockStyle.Fill;
 FormInput.Show ();
 
 
 The function can be implemented, but this will cause an inexplicable problem with the textbox control:
 1. Can't use the mouse to select any text on the textbox control. Either select all or not,
 2. Use the keyboard to select any text on the textbox control. SHIFT + arrow.
 
 This problem brings inconvenience to the input and modification of the textbox control, please master it.
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