Changing background image in TeeChart Delphi XE8 at run-time -

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i use gallery pictures (metal, wood, stone, clouds, etc.) available @ design time under chart/panel/image/gallery.

if set @ design time, can disable @ run time with:

 g.backimage := nil;

but if want set particular value, e.g. with

 g.backimage := 'metal';

i 'incompatible types' error, because compiler requires tbackimage value. not have source codes, , cannot find appropriate values on several google searches.

thinking could enum, tried typecasting one:

 g.backimage := tbackimage(1);

but generates exception. tried "guess" names, tbimetal, tbmetal, tmetal, , on, no avail...

what values?! thank you

tbackimage class methods must call. 

chart.backimage.loadfromfile('full/path/to/imagefile');

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