If you just select files, as Bart stated in another message, I think
TShellTreeView will be more adequate and easier than TTreeView (actually
TShellTreeView is a file tree specific descendent TTreeView).
In TTreeView (and TShellTreeView) you can enable multiselection by
adding tvoAllowMultiSelect in Options set (something like "with
TreeView1 do Options:=Options+[tvoAllowMultiSelect];" or better by
just checking Options/tvoAllowMultiSelect in the Object inspector)
https://wiki.freepascal.org/TTreeView#Example_of_using_Multiple_Node_Selection_for_Multiple_User_Selections
If you want checkboxes, I think it's possible with TVirtualStringTree
from the VirtualTreeView package, it may be a bit harder to implement
(as far as I remember you need your own data structure to store the
status of the tree) :
https://wiki.freepascal.org/VirtualTreeview
https://wiki.freepascal.org/VirtualTreeview_Example_for_Lazarus#Checkbox
VirtualTreeView package is included in Lazarus v2.0+, but I'm not sure
it's installed by default: if you don't find a tab "Virtual controls" in
your components, you may need to go to Package menu/Install packages,
select virtualtreeview_package 5.5.3.1 for installation and rebuild
Lazarus.
Here you should enable multiselection with something like
with VirtualStringTree1.TreeOptions do
SelectionOptions:=SelectionOptions+[toMultiSelect];
or by checking TreeOptions/SelectionOptions/toMultiSelect in the Object
inspector when your VirtualStringTree1 is selected.
(I've used VirtualTreeView a while ago, I didn't test checkboxes today)
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