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TO WORK WITH THE HUDFORM CLASS, REMEMBER TO SPECIFY THE CLASS INHERITANCE IN YOUR AUTOGENERATED FORM CODE:
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Imports Elektro.Application.ThirdParty.SharpDX.Types

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()>
Partial Class Form1 : Inherits HUDForm ' < HERE
' Autogenerated code here...
End Class


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Imports System
Imports Elektro.Application.ThirdParty.SharpDX.Types
Imports Elektro.Interop.Win32
Imports Elektro.Processes.Extensions.Process
Imports DxColor = SharpDX.Color

Public Class Form1 : Inherits HUDForm

    Private renderT As New Thread(New ParameterizedThreadStart(AddressOf Me.RenderWork))
    Private proc As Process ' The target process.

    Private Sub Form1_Shown(ByVal sender As Object, ByVal e As EventArgs)  Handles MyBase.Shown

        Me.proc = Process.GetProcessesByName("MyGame").SingleOrDefault()

        If (Me.proc Is Nothing) Then
            Application.Exit()

        Else
            Me.HwndTarget = Me.proc.MainWindowHandle
            Me.proc.Activate() ' Activates the target window.

            With Me.renderT
                .Priority = ThreadPriority.Normal
                .IsBackground = True
                .Start()
            End With

        End If

    End Sub

    ' Your custom SharpDX's renderization logic goes inside this method block. I just wrote a very simple example.
    Private Sub RenderWork(ByVal sender As Object)

        While True

            Me.Invoke(Sub() Me.Visible = NativeMethods.IsWindowVisible(Me.HwndTarget))

            If (Me.Visible) Then
                ' Call this method repeteadlly to overlap the HUDForm to the target window.
                Me.OverlapToWindow(Me.HwndTarget)

                With Me.Render
                    .BeginDraw()
                    .Clear(DxColor.Transparent)
                    .Flush()
                    .EndDraw()
                End With
            End If

        End While

    End Sub

End Class