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BackColor and transparency

Question asked by Livio on Nov 4, 2016
I make some experiments with the board STM32F469I-Discovery and the examples provided by ST; using the example LCD_DSI_CmdMode_DoubleBuffering I noticed some problem with the transparency with the BackColor of characters.
In the example there is text write over a blue rectangle, at line 452 of main.c the BackColor is set at Blue, BSP_LCD_SetBackColor(LCD_COLOR_BLUE), the same color of the rectangle, so the text it appears white over a blue rectangle.
I try to change the BackColor to LCD_COLOR_TRANSPARENT, I expected that there was no change on the display, but instead with this change the background of the character it turned black instead of remaining blue.
My expectation is wrong or is there a problem?

Thank you