Here is a list of all variables with links to the structures/unions they belong to:

borderStyle : WindowParameters
Bottom : WindowBorders
BottomLeft : WindowBorders
BottomRight : WindowBorders
height : Size
isOpaque : WindowParameters
label : LabelText
Left : WindowBorders
length : LabelText
lineAfterStep : ProgressBarStyle
lineBeforeStep : ProgressBarStyle
pointAfterStep : ProgressBarStyle
pointBeforeStep : ProgressBarStyle
position : ProgressBarParameters
progressBarStyle : ProgressBarParameters
Right : WindowBorders
steps : ProgressBarParameters
Top : WindowBorders
TopLeft : WindowBorders
TopRight : WindowBorders
width : ProgressBarParameters, Size
x : Point
y : Point