CheckedListBox.CreateParams Property


Gets the required creation parameters when the control handle is created.

 virtual property System::Windows::Forms::CreateParams ^ CreateParams { System::Windows::Forms::CreateParams ^ get(); };
protected override System.Windows.Forms.CreateParams CreateParams { get; }
member this.CreateParams : System.Windows.Forms.CreateParams
Protected Overrides ReadOnly Property CreateParams As CreateParams

Property Value

A CreateParams that contains the required parameters.


The following code example extends the CreateParams property of a Button derived class. The CreateParams.Style property is changed, which causes the button to display an Icon rather than an Image. This example requires that you have a class that inherits from the Button class.

virtual System::Windows::Forms::CreateParams^ get() override
   // Extend the CreateParams property of the Button class.
   System::Windows::Forms::CreateParams^ cp = __super::CreateParams;

   // Update the button Style.
   cp->Style |= 0x00000040; // BS_ICON value
   return cp;
protected override CreateParams CreateParams
        new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

        // Extend the CreateParams property of the Button class.
        CreateParams cp = base.CreateParams;
        // Update the button Style.
        cp.Style |= 0x00000040; // BS_ICON value

        return cp;

Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
        Dim SecPerm As New SecurityPermission(SecurityPermissionFlag.UnmanagedCode)

        ' Extend the CreateParams property of the Button class.
        Dim cp As System.Windows.Forms.CreateParams = MyBase.CreateParams
        ' Update the button Style.
        cp.Style = cp.Style Or &H40 ' BS_ICON value

        Return cp
    End Get
End Property


The CreateParams property should not be overridden and used to adjust the properties of your derived control. Properties such as the CreateParams.Caption, CreateParams.Width, and CreateParams.Height should be set by the corresponding properties in your control such as Control.Text, Control.Width and Control.Height. The CreateParams should only be extended when you are wrapping a standard Windows control class or to set styles not provided by the Windows Forms namespace. For more information about creating control parameters, see the CreateWindow and CreateWindowEx functions and the CREATESTRUCT structure documentation in the Windows Platform SDK reference located in the MSDN Library at

Notes to Inheritors

When overriding the CreateParams property in a derived class, use the base class's CreateParams property to extend the base implementation. Otherwise, you must provide all the implementation.


for operating with unmanaged code. Associated enumeration: UnmanagedCode

Applies to