Style: Fill inspector
Use the Fill inspector to choose a color or gradient for the inside of the selected shapes.
The Fill checkbox determines whether the shape should have a fill at all. When it is selected, controls for choosing the type of fill become available.
Use the pop-up menu on the left side of the inspector to choose from the five kinds of fill: Solid, Linear Blend, Radial Blend, Double Linear Blend, and Double Radial Blend.
The blend rotation control becomes active when you choose a linear blend; enter a number of degrees in the field or drag the circular control to set the angle of the gradient. The blend position control becomes active when you choose a radial gradient; drag its crosshair to move the gradient's center.
If you choose a solid fill, one color well becomes available on the right side of the inspector. Click it to choose the color of the fill.
If you choose a blend, two or three color wells become available on the right side of the inspector. Click them to choose the colors being blended together. Drag the slider on the far right to bias the blend toward one side or the other. If you have chosen a two-color blend, click the swap button between the two wells to exchange their colors.
OmniGraffle Pro offers an extra section in the Color panel for creating pattern fills.