From TDN

guiTextListControl - Justify Text

This simple addition to GuiTextListCtrl::onRenderCell in guiTextListCtrl.cpp will allow you to justify the cell text via the GUI profile if there is only one column in the control.

In GuiTextListCtrl::onRenderCell, in the for loop just under:

else
    slen = dStrlen(text);

add the following:

S32 xOffset = offset.x + 4 + mColumnOffsets[index];  // use this if we have more then one column
S32 txt_w = mFont->getStrWidth((const UTF8 *)mList[cell.y].text);

if (mColumnOffsets.size() == 1)  // otherwise, if there is only one column, we can now justify the text via the profile
    {
        switch (mProfile->mAlignment)
        {
            case GuiControlProfile::RightJustify:
                xOffset = offset.x + (mBounds.extent.x - txt_w) - 4;
                break;
            case GuiControlProfile::CenterJustify:
                xOffset = offset.x + (mBounds.extent.x / 2) - txt_w / 2;
                break;
            default: // GuiControlProfile::LeftJustify
                xOffset = offset.x + 4;
                break;
        }
    }

Then replace this line (also in GuiTextListCtrl::onRenderCell):

GFX->drawTextN(mFont, pos, text, slen, mProfile->mFontColors);

with the following line:

GFX->drawTextN(mFont, Point2I(xOffset, offset.y), text, slen, mProfile->mFontColors);

That's all!

Now if you only use one column in your guiTextListControl, the text will be rendered justified based on the justify = "left/center/right" field in your profile.