Many of the properties in jControls NF4 have Fill properties and Border properties. The Fill property is used to color the interior region of the control, and the Border property is used to color the outer perimeter of the control.

jControls NF4 supports 3 different fill/border brush types: Solid, LinearGradient, and RadialGradient. Each are described in turn below.

With the Solid BrushType, only Color1 has an effect; all other properties are irrelevant, and hidden in the Visual Studio property grid.

With the LinearGradient Type, the color with gradually change linearly from Color1 at Color1Point to Color2 at Color2Point. If ScaleGradient is False, the gradient does not scale with the size of the control.

With the RadialGradient Type, the color with gradually change radially outward from Color1 at Color1Point to Color2 with an x,y radius of Color2Point. In other words, Color1Point specifies the center of the radial gradient, and Color2Point specifies the x,y radius at which the gradient spreads.

If ScaleGradient is False, the gradient will not change with the size of the control. But, if ScaleGradient is true, Color1Point and Color2Point are interpreted as percentages of the control's size, so the gradient will scale proportionally with the size of the control.

The gradient travels only until point Color2Point (100,100) after which all points are Color2.

The gradient travels 100% of the width and 100% of the height; (i.e. Color2Point: 100,100 is interpreted as (100%,100%))

All colors can be entered with an alpha component to provide alpha blending and transparency. For example, typing “128, 255, 0, 0” in “Alpha, Red, Green, Blue” order would produce a 50% transparent (A=128/255 ≈ 50%) red (R=255) color.

Borders have an additional Thickness property used to specify the width of the perimeter to color.

The BackColor property is inherited from the .Net Compact Framework's Control class. It colors the entire area of the control before anything else is drawn.

Users will probably prefer to use the rich features of the Fill property to color their controls, so BackColor usually defaults to Color.Transparent.

The BackColor is draw to the screen before the BackgroundImage is drawn. If your control uses a BackgroundImage and has no transparent pixels, be sure to set the jForm's BackColor property to Transparent to avoid wasting resources drawing a background, only to have it replaced by the image.