On Windwos XP , Windows Vista, Windows 7 the RadForm/ShapedForm hides the taskbar when it is set to Auto-Hide. When you try to show the taskbar it appears behind (under) the RadForm instead of infront (over) it.

1. Create a new Form that inherits from RadForm and add some rad controls.
2. Checkin the file in your source control system
3. Open the form in design time will cause checkout

Setting the RightToLeftLayout to true together with RightToLeft = Yes, cuts off the form

To reproduce:
- Set the StartPosition to CenterScreen
- Show the form on a HDPI monitor

Workaround:
var form = new RadForm();

float dpiX, dpiY;
Graphics graphics = this.CreateGraphics();
dpiX = graphics.DpiX /100;
dpiY = graphics.DpiY /100;

form.StartPosition = FormStartPosition.Manual;
var monSize = Screen.FromControl(this).Bounds;
var centerX = (monSize.Width / 2) - (form.DesktopBounds.Width * dpiX / 2);
var centerY = (monSize.Height / 2) - (form.DesktopBounds.Height * dpiY/ 2);
form.Location = new Point((int)centerX,(int) centerY);
form.Show();

1. Create RadRibbonForm and add code to start maximized 
2. Add status strip with some items on the ribbon form 
3. in the form constructor create a MDI child form, set it to start maximized and show it 
4. The result is that there is gap between the child form and the status strip

Workaround:
protected override void OnShown(EventArgs e)
{
    base.OnShown(e);
 
    this.WindowState = FormWindowState.Minimized;
    this.WindowState = FormWindowState.Maximized;
}

When the RadForm is used as MDI Child hosted by RadDock, the rendering of the form is not appropriate.

The controls inside the form are not scaled correctly when the Form is shown on a monitor with DPI higher than 150%. An important step here is that the main monitor where the form is shown has a higher DPI. Moving the form from a monitor with 100% to a monitor with a higher DPI will not reproduce this behavior.

Workaround: set the RadRibbonFormBehavior1.AllowTheming property of the form to false

public class RadForm1
{
	public RadForm1()
	{
		InitializeComponent();

		this.RadRibbonFormBehavior1.AllowTheming = false;

	}
}

How to reproduce: set the Size property of the form in the designer of Visual Studio, pay attention to the serialized ClientSize value. Run the form and check the ClientSize, it has increased

Workaround: 
public partial class Form2 : RadForm
{
    public Form2()
    {
        InitializeComponent();
        Padding p = TelerikDpiHelper.ScalePadding(this.FormBehavior.ClientMargin, new SizeF(1f / this.RootElement.DpiScaleFactor.Width, 1f / this.RootElement.DpiScaleFactor.Height));
        this.MaximumSize = new Size(this.Size.Width - p.Horizontal, this.Size.Height - p.Vertical- this.FormBehavior.ClientMargin.Bottom + this.FormElement.TitleBar.Size.Height);
    }

    protected override void OnShown(EventArgs e)
    {
        base.OnShown(e);

        this.MaximumSize = new Size(0, 0);
    }
}

To reproduce:
RadForm form = new RadForm();
form.WindowState = FormWindowState.Maximized;
form.Text = string.Format("Child {0}", MdiChildren.Length + 1);
form.MdiParent = this;
form.Show();

Hover the Form's title bar the tooltip should start flashing/blinking

To reproduce:

public partial class RadRibbonForm1 : Telerik.WinControls.UI.RadRibbonForm
    {
        public RadRibbonForm1()
        {
            InitializeComponent();
            this.AllowAero = true;
            this.RibbonBar.QuickAccessToolbarBelowRibbon = false;
        }
    }

Note: the system buttons not always handle the mouse click.

Workaround: set AllowAero to false OR RibbonBar.QuickAccessToolbarBelowRibbon to true.

RadRibbonForm is flickering, when it is used as MDI Parent with applied background image.

To reproduce:
1. Drop a RadGridView and RadButton on Rad Form.
2. Set gris Anchor property to Top-Right-Bottom-Left and the buttons Anchor property to Right-Bottom.
3. Make sure that the RadForm's size is exactly as your desktop resolution(e.g. my 'RadForm' size and desktop resolution are 1920x1080).
4. Change its 'AutoScaleMode' property's value to 'Font'.
5. Build project.
6. Copy the resulted executable on your desktop and name it 'RadControlsWinFormsApp_Font'
7. Select again the RadForm.
8. Change its 'AutoScaleMode' property's value to 'DPI'
9. Build project.
10. Copy the resulted executable on your desktop and name it 'RadControlsWinFormsApp_DPI'
11. Select again the RadForm
12. Change its 'AutoScaleMode' property's value to 'Inherit'
13. Build project
14. Copy the resulted executable on your desktop and name it 'RadControlsWinFormsApp_Inherit'
15. Change your desktop resolution to a lower one (e.g. I've change it from 1920x1080 to 1600x900)
16. 'Auto-Hide' the Window's taskbar
17. Run the executables and see the results:
   17.1 In case of 'RadControlsWinFormsApp_Font' application, you should see that the 'RadGridView' control gets truncated + the lower right 'RadButton' is not visible anymore
   17.2 In case of 'RadControlsWinFormsApp_DPI' application, you should see that the 'RadGridView' control gets truncated + the lower right 'RadButton' is not visible anymore
   17.3 In case of 'RadControlsWinFormsApp_Inherit' application, you should see the controls on the form as you initially placed them.

Also this issue appears on 'Windows XP SP3 x86' and also on 'Windows 7 SP1 x64' .

Workaround:
- Set AutoScaleMode property to None or Inherit.

Good morning,

when I open a mdi child form from another child form and change WindowState from Minimize to Normal the form is not shown with correct size.

The size of RadForm under Windows XP is incorrect when its initial state as MDI child is Maximized and after that the state is changed to Normal.

Workaround:
Imports Telerik.WinControls.UI

Public Class BaseRadForm
    Inherits RadForm 

    Private Shared LastWindowState As FormWindowState = FormWindowState.Normal
    Private Shared suspendClientSizeChangedFlag As Boolean = False
 
    Protected Overrides Sub OnResizeBegin(ByVal e As System.EventArgs)
        Me.MaximumSize = New Size(0, 0)
        MyBase.OnResizeBegin(e) 
    End Sub
     
    Protected Overrides Sub OnActivated(ByVal e As System.EventArgs)
        Me.MaximumSize = New Size(0, 0)
        MyBase.OnActivated(e)
    End Sub

    Protected Overrides Sub OnDeactivate(ByVal e As System.EventArgs)
        Me.MaximumSize = New Size(0, 0)
        MyBase.OnDeactivate(e)
    End Sub

    Protected Overrides Sub OnClientSizeChanged(ByVal e As System.EventArgs)
        Dim osInfo As System.OperatingSystem = System.Environment.OSVersion
        If (suspendClientSizeChangedFlag OrElse osInfo.Version.Major >= 6) Then
            Return
        End If

        If Not LastWindowState.Equals(Me.WindowState) Then
            LastWindowState = Me.WindowState
            If Me.WindowState.Equals(FormWindowState.Normal) Then
                suspendClientSizeChangedFlag = True
                Me.MaximumSize = New Size(500, 500)
                suspendClientSizeChangedFlag = False
            ElseIf Me.WindowState.Equals(FormWindowState.Maximized) Then
                Me.MaximumSize = New Size(0, 0)
            End If
        Else
            Me.MaximumSize = New Size(0, 0)
        End If

        MyBase.OnClientSizeChanged(e)

    End Sub


End Class

To reproduce:
- Add four buttons to a RadForm
- On each button click use ThemeResolutionService to change the theme
=> the form size increases in height

Workaround:
Set the MaximumSize of the form to the current form size prior changing the theme and then remove this setting:
private void radButton1_Click(object sender, EventArgs e)
{
    this.MaximumSize = this.Size; ;
    ThemeResolutionService.ApplicationThemeName = "Office2010Blue";
    this.MaximumSize = Size.Empty;
}

VS 2022, Telerik 2022.2.510, NET 6.0 (sample app is attached)

1. Creating sample Telerik WinForms App.
2. Add a RadTextBox
3. Load Event with code
radTextBox1.Text = this.Size.ToString();

4. Run the App
5. Close the App
6. Move the RadTextBox Control at design time.
In design, the height of the form is 2 pixels taller.
Run these steps in a loop. After a few hours of work, the form exceeds the size of the screen.

The issue can be reproduced by creating a form with a width of 1200 pixels in an application that is DPI aware. Then the project is run on a tablet with low resolution and an increased DPI, e.g. 1024 x 768 and scaling 120%.

Workaround:
Public Class RadForm1
    Sub New()

        InitializeComponent()

        Dim g = Me.CreateGraphics()
        Dim scale = 96.0 / g.DpiX
        Me.Size = New Size(scale * Me.ClientSize.Width, scale * Me.ClientSize.Height)
        g.Dispose()
        Me.WindowState = FormWindowState.Normal
    End Sub
End Class

The attached video shows how you can reproduce this.

The issue is easily reproducible on a remote Windows 7 machine.