How to set the propertygrid popup window (winforms) to normal size?

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C#

How can you set the default size of a popup form with which the Popup Editor shows up when you invoke it from a Property Grid.

In Mypropertygrid I am opening a winform. when the button [...] which you press it pops up a winform.

my form is apprearing maximized.
In my form properties I have set the windowstate to normal and disabled the maximized button for the form.
how to set the propertygrid popup form to normal size?

What I have tried:

I have tried this .
Its not working

if (formType.IsAssignableFrom(m_EditControl.GetType()))
{
    Form EditForm = (Form)m_EditControl;
    System.Drawing.Rectangle resolutionRect =  System.Windows.Forms.Screen.FromControl(EditForm).Bounds;
    EditForm.WindowState = FormWindowState.Normal;
    if (EditForm.Width >= resolutionRect.Width || EditForm.Height >= resolutionRect.Height)
    {
        EditForm.WindowState = FormWindowState.Normal;
    }

    m_EditControl = (Control)EditForm;
    IEditorService.ShowDialog((Form)m_EditControl);
}