GTK Box
https://devdocs.io/gtk~3.20/

Multiple widgets can be added in GTK Box unlike containers.

```c

//#include "gtk/gtksignal.h"
#include <gtk/gtk.h>
#include <stdio.h>

int main(int argc, char *argv[])
{

	gtk_init(&argc,&argv);
	GtkWidget *window;

	GtkWidget *box;

	GtkWidget *button1;
	GtkWidget *button2;


	window=gtk_window_new(GTK_WINDOW_TOPLEVEL);

	box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
	

	gtk_window_set_default_size(GTK_WINDOW(window), 500, 500);

	button1= gtk_button_new_with_label("button1");
	// to initialize size(width and height) of gtk widget
	// Also this is the minimum size too
	gtk_widget_set_size_request(GTK_WIDGET(button1), 300, 300);
	button2= gtk_button_new_with_label("button2");

	gtk_container_add(GTK_CONTAINER(window), box);

	// 1st para : box,2nd: child, 3rd: isexpand, 4th : isFill, 5th: padding
	gtk_box_pack_end(GTK_BOX(box), button1,  TRUE,TRUE, 50);
	gtk_box_pack_start(GTK_BOX(box), button2,  TRUE,TRUE, 50);
	// homogeneous box means all child widgets inside it are of same size
	int isHomo=gtk_box_get_homogeneous(GTK_BOX(box));
	printf("is Homogenous? %d\n",isHomo);

	gtk_box_set_homogeneous(GTK_BOX(box),TRUE);

	isHomo=gtk_box_get_homogeneous(GTK_BOX(box));
	printf("is Homogenous after setter call? %d\n",isHomo);



//	gtk_container_remove(GTK_CONTAINER(window), button1);	
//	gtk_container_add(GTK_CONTAINER(window), button2);

	g_signal_connect(GTK_WINDOW(window),"destroy",G_CALLBACK(gtk_main_quit),NULL);
	gtk_widget_show_all(window);
	gtk_main();
	return 0;
}
```