Repairing VB.NET project - vb.net

Question

I throw in huge troubles with recreating a multproject solution into a single project solution where my program become unusable.
I have all code files saved and problem is with showing designer in IDE and errors connecting with that.
Situation:
All forms are subclassed with class called cls_transform which make form transparent while moving.
Public Class cls_transform
Inherits System.Windows.Forms.Form
Private _OpacityMove As Double = 0.5
Private _OpacityOriginal As Double = 1
Private Const WM_NCLBUTTONDOWN As Long = &HA1
Private Const WM_NCLBUTTONUP As Long = &HA0
Private Const WM_MOVING As Long = &H216
Private Const WM_SIZE As Long = &H5
Private Sub cls_transform_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Protected Overrides Sub DefWndProc(ByRef m As System.Windows.Forms.Message)
Static LButtonDown As Boolean
If CLng(m.Msg) = WM_NCLBUTTONDOWN Then
LButtonDown = True
ElseIf CLng(m.Msg) = WM_NCLBUTTONUP Then
LButtonDown = False
End If
If LButtonDown Then
If CLng(m.Msg) = WM_MOVING Then
If Me.Opacity <> _OpacityMove Then
_OpacityOriginal = Me.Opacity
Me.Opacity = _OpacityMove
End If
End If
ElseIf Not LButtonDown Then
If Me.Opacity <> _OpacityOriginal Then Me.Opacity = _OpacityOriginal
End If
MyBase.DefWndProc(m)
End Sub
Public Property OpacityMove() As Double
Get
Return _OpacityMove
End Get
Set(ByVal Value As Double)
_OpacityMove = Value
End Set
End Property
Private Sub InitializeComponent()
Me.SuspendLayout()
Me.ClientSize = New System.Drawing.Size(284, 262)
Me.Name = "cls_transform"
Me.ResumeLayout(False)
End Sub
End Class
This is how code of one empty form "frm_myForm" look like:
Public Class frm_myForm
Inherits cls_transform
Private Sub frm_myForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
End Class
And this is Designer code of that form:
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class frm_myForm
Inherits cls_transform
'Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
Try
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
Finally
MyBase.Dispose(disposing)
End Try
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.SuspendLayout()
'
'frm_myForm
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(284, 262)
Me.Name = "frm_myForm"
Me.Text = "frm_myForm"
Me.ResumeLayout(False)
End Sub
End Class
When I try to "View Designer" from IDE instead of to see a form I get white screen with error:
The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: frm_myForm --- The base class 'noviprog.cls_transform' could not be loaded. Ensure the assembly has been referenced and that all projects have been built.
That happen with all forms which inherits from cls_transform.
When cls_transform was in separate library (separate project of same solution) which was referenced to actual project that works.
Is it possible to get this working when code files and that class would be in same project and how to get this working?