ProressBar displays an integer value within a bounded interval, the following between 25 and 75. Its value is currently in the middle.

<progressbar minimum="25" maximum="75" value="50" orientation="vertical" />

orientationchoicehorizontalPossible values are: horizontal, and vertical. The default value, if not set, is horizontal.
minimuminteger0The progressbar's minimum value. By default, this is 0.
maximuminteger100The progressbar's maximum value. By default, this is 100.
valueinteger0The value is always between the progressbar's minimum and maximum values, inclusive. By default, the value equals the minimum.
name, enabled, visible, tooltip, property, width, height, colspan, rowspan, weightx, weighty, halign, and valign parameters are similar to component