this.properties = []; 
this.properties.push(new property(10, 1175, 798, 0, 'tabbladenset', 'true', 'Participants',true));
this.properties.push(new property(10, 1283, 901, 0, 'tabbladenset', 'true', 'Gallery',true));
this.properties.push(new property(10, 1270, 888, 0, 'tabbladenset', 'true', 'Dissemination',true));