[Admiral]

Да.

Код:

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        SetBackGroundColorOfMDIForm()
    End Sub
    Private Sub SetBackGroundColorOfMDIForm()
        Dim ctl As Control

        ' Loop through controls,  
        ' looking for controls of MdiClient type. 
        For Each ctl In Me.Controls
            If TypeOf (ctl) Is MdiClient Then

                ' If the control is the correct type,
                ' change the color.
                ctl.BackColor = System.Drawing.Color.White
            End If
        Next
    End Sub

Form.IsMdiContainer Property