What is common between chloroplasts, chromoplasts and leucoplasts ?

Chloroplast, chromoplast and leucoplast are all types of plastids which are classified on the basis of pigments they contain. Plastids are semiautonomous cell organelles bounded by two membranes and are found in only plant cells \& some unicellular organisms (Euglena) of uncertain affinity. The common among all the three organelles are that they have ability to multiply by a fission like process because these organelles contain there own genetic material and protein synthesizing machinery, i.e., DNA, RNA and ribosomes.