As suggested on the Silverlight PIT's, MAC like themes are very catching and adding a default theme for all controls with this style will be helpfull for developing app's with that desired look

ADD. Visual Style Builder - add "Recently opened" section in the File menu

Implemented in the UI for WinForms R2 2018 (version 2018.2.515) release.

To reproduce:
Set the DescriptionFont of RadMenuItem in VSB (see attached image).

Workaround: 
 Remove the setting from the XML.

Workaround: change the backcolors of the splitters at run-time

foreach (SplitterElement splitter in this.radSplitContainer1.Splitters)
{
    splitter.BackgroundFill.BackColor = Color.Red;
}

One cannot change the RadTextBox BackColor for the ContainsFocus and the ContainsMouse states.
Use the color dialog to change the color.

1. Open VisualStyleBuiler
2. Load TelerikMetroBlue theme
3. Search a certain image repository item and try to save the image.

Please refer to the attached gif file.

To reproduce:

Open VSB -> Open a image repository item with -> right click on the Image property and you will see the exception

To reproduce:

Navigate to an element which has image set for other than the default state or add such (e.g. RadCalendar/RadCalendarElement/NavigateForwardButton) -> select another state and right click on the Image property in the Elements window to select Save Image As. You will notice that only the default state is exported.

To reproduce:
- Open the Office2007 theme in VSB
- Change the DrawFill and BackColor properties for the  CommandBarRowElement
- Save use in a custom application.

Workaround:
this.commandBarRowElement1.DrawFill = true;
this.commandBarRowElement1.BackColor = Color.Black;
this.commandBarRowElement1.GradientStyle = GradientStyles.Solid; 

Clicking the delete button in VSB is way too easy to do on accident.  When clicked, the repo is deleted without a prompt and without the ability to undo.  The delete button is quite big and I've already accidentally deleted a few Repo's.  See attached screenshot.  

Feature request is one or both of the following:
- Add a "Are you sure?" prompt when clicking the button
- Add ability to use Undo to un-delete the repo.

In addition to that, it may be nice to make the delete button smaller.

To reproduce:
- Open the TelerikMetroBlue theme and select RadPanoramaElement in the Control Structure window.
- Expand PanoramaBackgroundImage element in the Elements window.

 Please note that the issue occur only in Windows 8.

Currently there is no way to export theme images as Bitmap (or any other image type).

Resolution: In Q2 2014 SP1 we introduced feature to export images from Visual Style Builder. The issue is the same like ADD. Visual Style Builder - add ability to export base64 strings to images (export image option in the context menu of all Image items). You can follow the link: http://tpdogfood.telerik.com/view#item/111008 

In VSB, if you go to the Help menu and click "View Help", and error will come up saying "The system cannot find the file specified".  I tried this with VSB 2014 Q1 SP1 and VSB 2014 Q2.

Add a VSB feature to export base64 strings.

To reproduce:
- Oped a predefined theme in Visual Style Builder
- Change an image property of an element that already has image (set it to a random local image).

The issue occurs only in Windows 8.

Apply a color setting to RadApplicationMenu and save the theme. Then unload theme, load it again and reset the control styles of RadApplicationMenu through the context menu. Save the theme, unload it and then load it again. You will notice that the style of the RadApplicationMenu is actually not reset.

When VSB need to save its layout in an xml file, this file should be placed in the directory of the user who is currently logged in.