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POHow do you prevent dragging controls out of a custom control at design time?
 

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  1. POHow do you prevent dragging controls out of a custom control at design time?
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    <p>In this user control the designer adds items to this control on the form and it dynamically places them on the form. Unfortunately once these controls are shown on the form in designer I can then grab one and pull it right outside of the custom control.</p> <p>How do I prevent this?</p> <p><em>EDIT</em> </p> <p>Please note that I am not looking for a solution or alternative to handling radio buttons, that is just the control of choice in this scenario. If it helps insert any type of control you want here (Button, Label, TextBox, CustomControl1), this problem is about handling a property with a collection/array type. The bottom line is that the user shouldn't be able to grab any of these controls in designer where an instance of this control has been defined and move it elsewhere. Just like a DataGridView or ListView albeit different types of objects, the user must use properties to change the contents of these controls. That is the beharior I am looking for.</p> <p>RBLTest.cs</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Linq; using System.Text; using System.Windows.Forms; namespace WFCL_Library { public partial class RBLTest : UserControl { private RadioButton[] _items; private int leftSpacing = 100; private int topSpacing = 25; public RBLTest() { InitializeComponent(); } private void RadioButtonList_Load(object sender, EventArgs e) { int curLeftPos = 0; int curTopPos = 0; foreach (RadioButton rb in _items) { rb.Location = new Point(curLeftPos, curTopPos); rb.Size = new Size(85, 17); curLeftPos += leftSpacing; if (curLeftPos &gt; this.Width) { curLeftPos = 0; curTopPos += topSpacing; } this.Controls.Add(rb); } } [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public RadioButton[] Items { get { return _items; } set { _items = value; } } } } </code></pre> <p>RBLTest.Designer.cs</p> <pre><code>namespace WFCL_Library { partial class RBLTest { /// &lt;summary&gt; /// Required designer variable. /// &lt;/summary&gt; private System.ComponentModel.IContainer components = null; /// &lt;summary&gt; /// Clean up any resources being used. /// &lt;/summary&gt; /// &lt;param name="disposing"&gt;true if managed resources should be disposed; otherwise, false.&lt;/param&gt; protected override void Dispose(bool disposing) { if (disposing &amp;&amp; (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Component Designer generated code /// &lt;summary&gt; /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// &lt;/summary&gt; private void InitializeComponent() { this.SuspendLayout(); // // RBLTest // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.Name = "RBLTest"; this.Size = new System.Drawing.Size(407, 44); this.Load += new System.EventHandler(this.RadioButtonList_Load); this.ResumeLayout(false); } #endregion } } </code></pre>
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    1. USMohgeroth
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      1. POHow do you prevent dragging controls out of a custom control at design time?
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    1. COIt is *very* unclear how the designer could ever assign the Items property. The simple explanation is that you put the radio buttons on top of the UserControl, not inside of them. Enabling design mode for controls inside a UserControl after it was placed on a form requires a custom designer.
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      1. POHow do you prevent dragging controls out of a custom control at design time?
      1. USHans Passant
    2. COI don't want design controls for controls inside of a user control that's just it. Build this control, drag it from the toolbox onto the form and select the items property and add new instances. It creates radio buttons and displays them accordingly as expected. What's unexpected is that you can just grab one of those radio buttons and rip it right out of the custom control and drop it outside of that custom control onto the form. The button is still part of the items list in the custom control even though now its displayed outside of it.
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      1. POHow do you prevent dragging controls out of a custom control at design time?
      1. USMohgeroth
 

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