WinForms : Form loses visual style when opened as Modal

Question

I am using DevComponents components to create forms and as you know these components come with a StyleManager that user can change the visual style of a form. the problem is when i try to open these forms as Modal, they lose their visual style and switch back to original windows style.

this is the code from Form1.Designer (as i mentioned i am using OfficeForm) :

Partial Class Form1
    Inherits DevComponents.DotNetBar.OfficeForm
.
.
.

this is the code which i use that opens form as MDIChild which works just fine :

Public Sub OpenMDI(ByVal frm As Form)
    frm.MdiParent = MainMenu
    frm.Show()
End Sub

this is the code i am using to open form as Modal :

Form1.ShowDialog()

and these are the screenshots with and without visual styles ( - )

Answer 1

Set EnableGlass property of from to False

eg. :

Form1.EnableGlass = False;