Unable to use setTitle method when using a string concatenated with datastore data

[d1984]

I have the following code attached as a handler to a button:


myapp.stores.vehicleInfo.load();
myapp.toolbars.vehicleInfoToolbar.setTitle('Image 1 of ');


Which within my defined namespace loads the store and then sets the title of a toolbar - this works.
This code doesn't work:


myapp.stores.vehicleInfo.load();
myapp.toolbars.vehicleInfoToolbar.setTitle('Image 1 of'+ myapp.stores.vehicleInfo.data.items[0].data.imageTotal);

giving the error: 'cannot read property of "data" of undefined'
But when I click the button a second time, it sets the title of the toolbar as expected e.g. Image 1 of 10.
What is going on here? How do I solve this? I tried using the settimeout method in case the setTitle method was being called too early before the store was finished loading. However this failed to solve the problem.
Many thanks.

[steve1964]

Hi myapp.stores.vehicleInfo.load(); is an async process, at the time you use:
myapp.toolbars.vehicleInfoToolbar.setTitle('Image 1 of'+myapp.stores.vehicleInfo.data.items[0].data.imageTotal);
the store is not loaded yet, you have to fire the load event of the store and use setTtle in this function

[d1984]

Thanks that is the right answer. =D>