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POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
 

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  1. POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
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    <p>Hoping someone can help me out here.</p> <p>I'm creating a table in some code-behind and trying to dynamically add a <code>ToggleButtonExtender</code> to a standard <code>CheckBox</code>. here is my code:</p> <pre><code>cell = new TableCell(); CheckBox cb = new CheckBox(); cb.ID = "myID"; cb.Checked = true; cell.Controls.Add(cb); // ToggleButton control to allow user to toggle images. ToggleButtonExtender toggleButton = new ToggleButtonExtender(); toggleButton.ID = "Toggle" + cb.ID; toggleButton.TargetControlID = cb.ID; toggleButton.ImageWidth = 32; toggleButton.ImageHeight = 32; toggleButton.CheckedImageAlternateText = "Check"; toggleButton.UncheckedImageAlternateText = "UnCheck"; toggleButton.UncheckedImageUrl = @"~/imgs/x.png"; toggleButton.CheckedImageUrl = @"~/imgs/check.png"; toggleButton.Enabled = true; cell.Controls.Add(toggleButton); row.Controls.Add(cell); </code></pre> <p>I get this error when it tries to create the table:</p> <p><code>Microsoft JScript runtime error: Sys.ArgumentException: Value must not be null for Controls and Behaviors. Parameter name: element</code></p> <p>If I remove the <code>ToggleButtonExtender</code> creation logic the table is created just fine (but without the <code>ToggleButtonExtender</code> functionality I want).</p> <p>Any ideas? I've tried various things over the past few hours but nothing works.</p> <p>Thanks!</p> <p>----- UPDATE------</p> <p>This works:</p> <pre><code>&lt;asp:Panel ID="myPanel" runat="server"&gt; &lt;/asp:Panel&gt; CheckBox cb = new CheckBox(); cb.ID = "myCB"; cb.Checked = true; myPanel.Controls.Add(cb); ToggleButtonExtender toggleButton = new ToggleButtonExtender(); toggleButton.ID = "ToggleButtonExtender" + cb.ID; toggleButton.TargetControlID = cb.ID; toggleButton.ImageWidth = 50; toggleButton.ImageHeight = 50; toggleButton.UncheckedImageUrl = @"~/imgs/x.png"; toggleButton.CheckedImageUrl = @"~/imgs/check.png"; myPanel.Controls.Add(toggleButton); </code></pre> <p>But adding it to a <code>TableCell</code> doesn't seem to be working.</p>
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    1. USMr. Spock
    1. USMr. Spock
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      1. POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
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    1. COIf you make your `CheckBox` non-dynamic (ie: add it to the aspx), can you use that code to dynamically add the `ToggleButtonExtender` to the non-dynamic `CheckBox`?
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      1. POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
      1. USGarrison Neely
    2. CONope. If I create a static `CheckBox` it doesn't work either. If I add a static `ToggleButtonExtender' it DOES work. However, if I take those EXACT settings from the .aspx page and put them in my code-behind it doesn't work (see my update above).
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      1. POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
      1. USMr. Spock
    3. COThat makes me think there is something with your dynamically-generated code. I don't know what's missing, because the error message isn't very helpful, but I'm betting it's a required property that you aren't setting, or maybe it doesn't like ID being set the way you're setting it.
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      1. POHow do you dynamically add a ToggleButtonExtender to a CheckBox control in C#?
      1. USGarrison Neely
 

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