I am showing negative number data on my horizontal bar graph and our standards are to display negative numbers with brackets instead of (-) minus signs. My data is formatted as D5B but the graph defaults to the minus sign.

Using DataTextFormatPattern should do it for you. However, I cannot find a good example that demonstrates how to use it. Check with IB for assistance.

The following commands seem to manipulate the formatting of my data on the bars but I still do not know how to force the negative sign to be a bracket.
setDisplay(getDataText(),true);
setDataTextFormat(-1);
setDataTextFormatPattern("##");

I'm taking a wild guess here but try changing the pattern to "##;[##]". I honestly have no idea if this will work.

setDataTextFormatPattern("##;[##]");

Worked perfectly. Thank You!