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POShould Form.ShowDialog(IWin32Window) work with any window handle?
 

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    <p>When using <code>System.Windows.Forms.ShowDialog(IWin32Window)</code>, should I be able to pass in an <code>IWin32Window</code> representing any window handle and have it be modal with respect to that window?</p> <p>As part of an Internet&nbsp;Explorer&nbsp;7 extension I'm trying to open a window modal with respect to an Internet&nbsp;Explorer tab. It's not the currently selected tab, but I can get the hwnd of the tab OK. However, when I pass this to ShowDialog my Form is shown, but it's not modal with respect to anything: I can still do things in Internet&nbsp;Explorer, including in the tab that's supposed to be the owner. My form is shown floating above the Internet&nbsp;Explorer windows and it stays on top, so it's not like it's just opened as a normal form, but it's not correctly modal.</p> <p>Using <a href="http://msdn.microsoft.com/en-us/library/aa264396%28v=vs.60%29.aspx" rel="nofollow noreferrer">Spy++</a>, I can find my form and it's owner handle is correctly set. </p> <p>Does this mean that something has gone wrong, or I'm doing something wrong? How do I make my form correctly modal?</p> <p>FYI, I'm using this wrapper class to create an <code>IWin32Window</code> from a <code>hwnd</code> (thanks <a href="http://ryanfarley.com/blog/archive/2004/03/23/465.aspx" rel="nofollow noreferrer">Ryan!</a>):</p> <pre><code>/// &lt;summary&gt; /// Wrapper class so that we can return an IWin32Window given a hwnd /// &lt;/summary&gt; public class WindowWrapper : System.Windows.Forms.IWin32Window { public WindowWrapper(IntPtr handle) { _hwnd = handle; } public IntPtr Handle { get { return _hwnd; } } private IntPtr _hwnd; } </code></pre> <p>UPDATE: Using Internet&nbsp;Explorer&nbsp;7 &amp; .NET 2.0</p> <p>UPDATE: Playing around some more with Spy++ and the handles it exposes, I find that if I use a different <code>hwnd</code> then I can make my window modal to the tab:</p> <p>I was using the tab's <code>hwnd</code> as suggested by the <a href="http://msdn.microsoft.com/en-us/library/aa752126(VS.85).aspx" rel="nofollow noreferrer">IWebBrowser2.HWND doc</a>, which in Spy++ appears as class <code>TabWindowClass</code>. It has a child of class <code>Shell DocObject View</code>, which has a child of Internet_Explorer_Server. If I use the <code>hwnd</code> of the <code>Internet Explorer_Server</code> then it works correctly, for example, when I click with the mouse on other tabs, Internet&nbsp;Explorer reacts normally. When I click with the mouse on the tab of interest, it plays the windows d'oh sound and doesn't do anything.</p> <p>I don't yet know how to programatically get the Internet_Explorer_Server <code>hwnd</code>, but it should be possible.</p> <p>Also, for what it's worth, while playing with other window handles I was generally able to make my form modal to other applications and dialogs. So I guess the answer to my question is 'many but not all handles'... possibly it depends on the application?</p> <p>UPDATE: Another side-note: The original reason I wanted to make my form modal to the tab instead of the whole window is that when opening a <code>MessageBox</code> from my form, passing the form as owner, the <code>MessageBox</code> would not always open on top of my form. If a new Internet&nbsp;Explorer tab had just been opened but wasn't active then the <code>MessageBox</code> would be hidden and that tab would start flashing. However, since Internet&nbsp;Explorer was disabled with my form opened modal it wasn't possible to switch to that tab, so Internet&nbsp;Explorer would be frozen. I thought that opening my form modal to the tab would solve this, but I've found another solution is to avoid using <code>MessageBox</code>: if I use a second form and <code>ShowDialog(this)</code> from my first form then the second form correctly opens to the front. So it seems that <code>Form.ShowDialog()</code> works better than <code>MessageBox.Show()</code> in some cases. More discussion in <em><a href="http://social.msdn.microsoft.com/Forums/en-US/ieextensiondevelopment/thread/df0fe7f2-0153-47d9-b18f-266d57ab7909" rel="nofollow noreferrer">Problems with modal dialogs and messageboxes</a></em>.</p>
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    1. COWhich version of IE are you using?
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