There are solutions posted on the Telerik forums about how to accomplish this using styles but it would save people a lot of time and work (especially if they are using several barcode types) if there was a Boolean property that could be set to hide or display the barcode text (much like the RenderChecksum property is used to hide or display the checksum for the barcode)

When the Background / Foreground property of the RadBarcodeQR control is set, at runtime time that property is ignored.

Workaround: 
On loaded, change the pixel value  of the ImageSource of the code in the following manner
(in case the Foreground is set to a valid SolidColorBrush value):

public void RadBarcodeQR_Loaded(object sender, RoutedEventArgs e)
{
	Image image = this.ChildrenOfType<Image>().First();
	ImageSource src = image.Source;
	Color c = ((sender as RadBarcodeQR).Foreground as SolidColorBrush).Color;
	image.Source = ChangePixelValue(src, c);
}

public static WriteableBitmap ChangePixelValue(ImageSource src, Color c)
{
	BitmapSource originalSource = src as BitmapSource;
	WriteableBitmap modifiedSource = new WriteableBitmap(originalSource);

	int h = modifiedSource.PixelHeight;
	int w = modifiedSource.PixelWidth;
	int[] pixelData = new int[w * h];
	int widthInBytes = 4 * w;

	modifiedSource.CopyPixels(pixelData, widthInBytes, 0);

	int colorInt = BitConverter.ToInt32(new byte[] { c.B, c.G, c.R, 0x00 }, 0);
	for (int i = 0; i < pixelData.Length; i++)
	{
		pixelData[i] ^= colorInt;
	}

	modifiedSource.WritePixels(new Int32Rect(0, 0, w, h), pixelData, widthInBytes, 0);
	return modifiedSource;
}

Provide support for Swiss QR code.

Currently the Mode of the barcode can be set to determine whether alphanumeric characters or Kanji characters are allowed. We can introduce an option to allow both types of characters. 

Implement support for Chinese symbols. Currently, if you enter the barcode Text in Chinese, the value will be coerced to to an empty string and nothing will be rendered.

If you change the value of the Text property of RadBarcodeQR while its Visibility is set to Collapsed and then set it back to Visible, the barcode generates a blurry image.

To work this around you can call the OnApplyTemplate() method of RadBarcodeQR after you change its Visibility to Visible.

Implement Intelligent Mail Barcode type.

Currently we can rotate the entire barcode so that it is inverted using styles, however, this means that the text with the barcode is also inverted and so it is displayed upside down. It would be nice to have the ability to "invert" the barcode portion only (turn the barcode upside down) 

The UPCE values entered in the RadBarcode control when Symbology is set to UPCE are not displayed. 

To work this around use the old RadBarcodeUPCE control until this is fixed.

Add a property that determines if the check digit (checksum) should be displayed. Currently, you can enable a checksum calculation that is displayed in the barcode image by setting the AutoChecksum property of the symbology to True, but there is no way to display the calculated value in the text under the barcode.