Here is a simple of creating and displaying trees.
/**************************** ExampleTree ******************************/
#include "EZ.h"
main(int ac, char **av)
{
EZ_Item *item;
EZ_Widget *tree, *btn;
EZ_TreeNode *root, *node1, *node2, *node11, *tmp;
EZ_TextProperty *p1, *p2, *p3;
EZ_Initialize(ac, av, 0);
tree = EZ_CreateListTree(NULL, 1, 1);
EZ_ConfigureWidget(tree, EZ_WIDTH, 400, EZ_HEIGHT, 400, EZ_IPADY, 2,
EZ_SELECTION_FOREGROUND, "black", 0);
p1 = EZ_GetTextProperty(EZ_PIXMAP_FILE, "question.xpm",
EZ_FOREGROUND, "red",
EZ_FONT_NAME,
"-Adobe-Helvetica-Medium-R-Normal--*-180-*-*-*-*-*-*",
0);
p2 = EZ_GetTextProperty(EZ_PIXMAP_FILE, "folder.xpm",
EZ_FOREGROUND, "blue", 0);
p3 = EZ_GetTextProperty(EZ_PIXMAP_FILE, "file.xpm",
EZ_FOREGROUND, "yellow", 0);
/* the root node */
item = EZ_CreateLabelItem("root", p1);
root = EZ_CreateTreeNode(NULL, item);
/* children */
item = EZ_CreateLabelItem("child 1", p2);
node1 = EZ_CreateTreeNode(root, item);
item = EZ_CreateLabelItem("child 2", p2);
node2 = EZ_CreateTreeNode(root, item);
/* grand children */
item = EZ_CreateLabelItem("grandchild 11", p3);
node11 = EZ_CreateTreeNode(node1, item);
item = EZ_CreateLabelItem("grandchild 12", p3);
tmp = EZ_CreateTreeNode(node1, item);
item = EZ_CreateLabelItem("grandchild 21", p3);
tmp = EZ_CreateTreeNode(node2, item);
/* grand grand children */
item = EZ_CreateLabelItem("gg child 111", p2);
tmp = EZ_CreateTreeNode(node11, item);
btn = EZ_CreateButton(NULL, "A Widget", 0);
item = EZ_CreateWidgetItem(btn);
tmp = EZ_CreateTreeNode(node11, item);
EZ_TreeSetCharacter(root, EZ_TREE, 20, 40, 1);
EZ_SetListTreeWidgetTree(tree, root);
EZ_DisplayWidget(tree);
EZ_EventMainLoop();
}