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copied!<p>You need to change window's class style using <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms633588(v=vs.85).aspx" rel="nofollow"><code>SetClassLong</code></a></p> <p>There is example in <a href="/questions/tagged/c%23" class="post-tag" title="show questions tagged 'c#'" rel="tag">c#</a>, but idea is still the same:</p> <pre><code>public partial class Form1 : Form { protected override CreateParams CreateParams { get { var cp = base.CreateParams; //cp.ClassStyle |= 0x200; // note this is off return cp; } } public Form1() { InitializeComponent(); } // here button is being disabled private void Form1_Load(object sender, EventArgs e) { HandleRef handle = new HandleRef(null, this.Handle); var cp = CreateParams; cp.ClassStyle = cp.ClassStyle | (0x200); IntPtr style = new IntPtr(cp.ClassStyle); var classLong = Form1.SetClassLong(handle, (int)ClassLongFlags.GCL_STYLE, style); } // here is being enabled private void Form1_DoubleClick(object sender, EventArgs e) { HandleRef handle = new HandleRef(null, this.Handle); var cp = CreateParams; cp.ClassStyle = cp.ClassStyle & (~0x200); IntPtr style = new IntPtr(cp.ClassStyle); var classLong = Form1.SetClassLong(handle, (int)ClassLongFlags.GCL_STYLE, style); } } </code></pre> <p><code>SetClassLong</code>, <code>ClassLongFlags</code> can be found here <a href="http://www.pinvoke.net/" rel="nofollow">http://www.pinvoke.net/</a> </p> <p>Here is <a href="/questions/tagged/c%2b%2b-cli" class="post-tag" title="show questions tagged 'c++-cli'" rel="tag">c++-cli</a> version, without pinvoke.</p> <pre><code>#include <windows.h> #define GCL_STYLE -26 using namespace System::Windows::Forms; using namespace System::Runtime::InteropServices; using namespace System; public ref class Form1 : public Form { public: Form1() { InitializeComponent(); this->Load += gcnew EventHandler( this, &Form1::Form1_Load); this->DoubleClick += gcnew EventHandler( this, &Form1::Form1_DoubleClick); } protected: virtual property System::Windows::Forms::CreateParams^ CreateParams { System::Windows::Forms::CreateParams^ get() override { System::Windows::Forms::CreateParams^ cp = Form::CreateParams; //cp->ClassStyle |= 0x200; //CP_NOCLOSE_BUTTON return cp; } } private: void Form1_Load(Object^ sender, EventArgs^ e) { HandleRef^ handle = gcnew HandleRef(nullptr, this->Handle); System::Windows::Forms::CreateParams^ cp = Form::CreateParams; cp->ClassStyle = cp->ClassStyle | (0x200); IntPtr^ style = gcnew IntPtr(cp->ClassStyle); ::SetClassLong( (HWND)this->Handle.ToPointer(), (int)GCL_STYLE, (LONG)style->ToInt32()); } // here is being enabled // possibly, it is gonna be your `foo` void Form1_DoubleClick(Object^ sender, EventArgs^ e) { HandleRef^ handle = gcnew HandleRef(nullptr, this->Handle); System::Windows::Forms::CreateParams^ cp = Form::CreateParams; cp->ClassStyle = cp->ClassStyle & (~0x200); IntPtr^ style = gcnew IntPtr(cp->ClassStyle); ::SetClassLong( (HWND)this->Handle.ToPointer(), (int)GCL_STYLE, (LONG)style->ToInt32()); } }; </code></pre>

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