This method sets a widget's color value.
| Parameter | Description | 
|---|---|
| r | red component of the color to set | 
| g | green component of the color to set | 
| b | blue component of the color to set | 
| a | alpha component of the color to set | 
| color | color to set | 
| index | color index | 
The color index can be any of the following values:
#include "Leadwerks.h"
using namespace Leadwerks;
int main(int argc, const char* argv[])
{
    // Get the displays
    auto displays = GetDisplays();
    // Create a window
    auto window = CreateWindow("Leadwerks", 0, 0, 800, 600, displays[0]);
    // Create User Interface
    auto ui = CreateInterface(window);
    auto sz = ui->root->ClientSize();
    // Create widget
    auto panel = CreatePanel(50, 50, sz.x - 100, sz.y - 100, ui->root);
    // Fade to black over ten seconds
    panel->SetColor(0, 0, 0, 1, WIDGETCOLOR_BACKGROUND, 10000);
    while (true)
    {
        const Event ev = WaitEvent();
        switch (ev.id)
        {
        case EVENT_WINDOWCLOSE:
            return 0;
            break;
        }
    }
    return 0;
}