By default, the BackgroundExt property is empty. Using the BackgroundExt property you have unlimited options to show any HTML text, images, colors, EBNs, patterns, frames anywhere on the item's background. For instance, let's say you need to display more colors on the item's background, or just want to display an additional caption or image to a specified location on the item's background. The EBN String Format defines the parts of the EBN to be applied on the item's background. The EBN is a set of UI elements that are built as a tree where each element is anchored to its parent element. The BackgroundExt property is applied right after setting the object's backcolor, and before drawing the default object's captions, icons or pictures. The BackgroundExt property is shown on the item's background, while the ForegroundExt property is shown on the item's foreground. Using the BackgroundExt property you have unlimited options to show any HTML text, images, colors, EBNs, patterns, frames anywhere on the items' background. 

Easy samples:

• "[pattern=6]", shows the BDiagonal pattern on the object's background.

  

• "[frame=RGB(255,0,0),framethick]", draws a red thick-border around the object.

  

• "[frame=RGB(255,0,0),framethick,pattern=6,patterncolor=RGB(255,0,0)]", draws a red thick-border around the object, with a patter inside.

  

• "[[patterncolor=RGB(255,0,0)](none[(4,4,100%-8,100%-8),pattern=0x006,patterncolor=RGB(255,0,0),frame=RGB(255,0,0),framethick])]", draws a red thick-border around the object, with a patter inside, with a 4-pixels wide padding:

  

• "top[4,back=RGB(0,0,255)]", draws a blue line on the top side of the object's background, of 4-pixels wide.

  

• "[text=`caption`,align=0x22]", shows the caption string aligned to the bottom-right side of the object's background.

  

• "[text=`<img>flag</img>`,align=0x11]" shows the flag picture and the sweden string aligned to the bottom side of the object.

  

• "left[10,back=RGB(255,0,0)]", draws a red line on the left side of the object's background, of 10-pixels wide.

  

• "bottom[50%,pattern=6,frame]", shows the BDiagonal pattern with a border arround on the lower-half part of the object's background.

  

• "root[text=`caption <b>2`,align=0x22](client[text=`caption <b>1`,align=0x20])", shows the caption 1 aligned to the bottom-left side, and the caption 2 to the bottom-right side

  

The Exontrol's eXButton WYSWYG Builder helps you to generate or view the EBN String Format, in the To String field as shown in the following screen shot: 

The To String field of the EBN Builder defines the EBN String Format that can be used on BodyBackgroundExt property.

The EBN String Format syntax in BNF notation is defined like follows:

<EBN> ::= <elements> | <root> "(" [<elements>] ")"
<elements> ::= <element> [ "," <elements> ]
<root> ::= "root" [ <attributes> ] | [ <attributes> ]
<element> ::= <anchor> [ <attributes> ] [ "(" [<elements>] ")" ]
<anchor> ::= "none" | "left" | "right" | "client" | "top" | "bottom"
<attributes> ::= "[" [<client> ","] <attribute> [ "," <attributes> ] "]"
<client> ::= <expression> | <expression> "," <expression> "," <expression> "," <expression>
<expression> ::= <number> | <number> "%"
<attribute> ::= <backcolor> | <text> | <wordwrap> | <align> | <pattern> | <patterncolor> | <frame> | <framethick> | <data> | <others>
<equal> ::= "="
<digit> ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
<decimal> ::= <digit><decimal>
<hexadigit> ::= <digit> | "A" | "B"  "C" | "D" | "E"  "F"
<hexa> ::= <hexadigit><hexa>
<number> ::= <decimal> | "0x" <hexa>
<color> ::= <rgbcolor> | number
<rgbcolor> ::= "RGB" "(" <number> "," <number> "," <number> ")"
<string> ::= "`" <characters> "`" | "'" <characters> "'" | " <characters> "
<characters> ::= <char>|<characters>
<char> ::= <any_character_excepts_null>
<backcolor> ::= "back" <equal> <color>
<text> ::= "text" <equal> <string>
<align> ::= "align" <equal> <number>
<pattern> ::= "pattern" <equal> <number>
<patterncolor> ::= "patterncolor" <equal> <color>
<frame> ::= "frame" <equal> <color>
<data> ::= "data" <equal> <number> | <string>
<framethick> ::= "framethick"
<wordwrap> ::= "wordwrap"

Others like: pic, stretch, hstretch, vstretch, transparent, from, to are reserved for future use only.