Use the BackgroundExtValue property to change at runtime any UI property for any part that composes the EBN String Format. The BackgroundExtValue property has no effect if the BackgroundExt property is empty ( by default ). The idea is as follows: first you need to decide the layout of the UI to put on the object's background, using the BackgroundExt property, and next ( if required ), you can change any property of any part of the background extension to a new value. In other words, let's say you have the same layout to be applied to some of your objects, so you specify the BackgroundExt to be the same for them, and next use the BackgroundExtValue property to change particular properties ( like back-color, size, position, anchor ) for different objects.

You can access/define/change the following UI properties of the element:

• exBackColorExt(1), Indicates the background color / EBN color to be shown on the part of the object. Sample: 255 indicates red, RGB(0,255,0) green, or 0x1000000. (Color/Numeric expression, The last 7 bits in the high significant byte of the color indicate the identifier of the skin being used )
• exClientExt(2), Specifies the position/size of the object, depending on the object's anchor. The syntax of the exClientExt is related to the exAnchorExt value. For instance, if the object is anchored to the left side of the parent ( exAnchorExt = 1 ), the exClientExt specifies just the width of the part in pixels/percents, not including the position. In case, the exAnchorExt is client, the exClientExt has no effect. Sample: 50% indicates half of the parent, 25 indicates 25 pixels, or 50%-8 indicates 8-pixels left from the center of the parent. (String/Numeric expression)
• exAnchorExt(3), Specifies the object's alignment relative to its parent.  (Numeric expression)
• exTextExt(4), Specifies the HTML text to be displayed on the object.  (String expression)
• exTextExtWordWrap(5), Specifies that the object is wrapping the text. The exTextExt value specifies the HTML text to be displayed on the part of the EBN object. This property has effect only if there is a text assigned to the part using the exTextExt flag. (Boolean expression)
• exTextExtAlignment(6), Indicates the alignment of the text on the object. The exTextExt value specifies the HTML text to be displayed on the part of the EBN object. This property has effect only if there is a text assigned to the part using the exTextExt flag (Numeric expression)
• exPatternExt(7), Indicates the pattern to be shown on the object. The exPatternColorExt specifies the color to show the pattern. (Numeric expression)
• exPatternColorExt(8), Indicates the color to show the pattern on the object. The exPatternColorExt property has effect only if the exPatternExt property is not 0 ( empty ). The exFrameColorExt specifies the color to show the frame ( the exPatternExt property includes the exFrame or exFrameThick flag ). (Color expression)
• exFrameColorExt(9), Indicates the color to show the border-frame on the object. This property set the Frame flag for exPatternExt property. (Color expression)
• exFrameThickExt(11), Specifies that a thick-frame is shown around the object. This property set the FrameThick flag for exPatternExt property. (Boolean expression)
• exUserDataExt(12), Specifies an extra-data associated with the object. (Variant expression)

For instance, having the BackgroundExt on "bottom[50%,pattern=6,frame]"

we got:

so let's change the percent of 50% to 25% like  BackgroundExtValue(1,2) on "25%", where 1 indicates the first element after root, and 2 indicates the exClientExt property, we get:

In VB you should have the following syntax:

.BackgroundExt = "bottom[50%,pattern=6,frame]"
.BackgroundExtValue(exIndexExt1, exClientExt) = "25%"